The stage of doubts, errors and interferences is well behind us. Wireless video monitoring in real time has become a practically essential, pretty fashionable solution featuring simple configuration and easy operation, which can be summarized in four actions: turn on, pair, transmit and display

*This content is included in the November issue of TM BROADCAST. You can access the full magazine here.

Wireless systems in the audiovisual sector, especially in audio, are a reality that is clearly well established in the workings of this industry. But in the field of video, it has taken a little more effort for professionals to make use of these solutions for live work. We were more conservative and opted for a good cable run and a broadcast connection system.

Clearly, things have changed for the better. At present, real-time wireless video monitoring moves forward with a series of parameters that have allowed its expansion and success in the audiovisual and live sectors, as well as in the field of security and video surveillance, drones and robotics, or for industrial and emergency/rescue applications.

When making reference to a real-time wireless video monitoring system we are including many details and solutions that we need to know and understand. First of all, we need to distinguish what elements are included in these systems:

1. TX or transmitter. It is the piece of equipment in charge of converting and sending mainly the video signal wirelessly. We can find a separate TX module or also a video monitor with a built-in TX (which allows us to view the video and send it at the same time).
2. RX or receiver. It is the device that receives the wireless signal sent by the TX.
3. Monitor or recorder. It is the destination equipment for the signal received by the RX. We can also include any type of display, control station or monitoring software (OBS, vMix, NDI Monitor, etc.).

Wireless video monitoring can be unireceiver or multireceiver (simultaneous), and each of the existing solutions works under Wi-Fi technology, RF technology or the manufacturer’s own protocols (a wireless private network -point to point or mesh-). In addition, some kits allow remote/IP/Internet streaming.

The most basic and simple operation to understand these systems involves, for example, a TX being connected via HDMI or SDI to a ‘main’ camera. The TX converts and sends the video signal wirelessly both to a receiver (RX) -which, connected to a monitor allows viewing the received video or other use- and also to a recorder, in order to store this video output. It can be a kit comprising several RXs, which allows to have more users interconnected wirelessly.

Wireless video monitoring can be unireceiver or multireceiver, and each of the existing solutions works under Wi-Fi technology, RF technology or a manufacturer’s proprietary protocols. In addition, some kits allow remote/IP/Internet streaming

It’s now time to learn a little more about some important parameters and specifications for a good choice tailored to production needs where real-time wireless video monitoring is needed:

• CONNECTIVITY. Nowadays, the most standard connections for TX equipment (outside the wireless field) are made through BNC and HDMI connectors, thus enabling to share video signals as the main output along with others such as: tally signals, TC, triggers, RS485/RS422 control protocols, among others.

In the case of the RX, to these two physical connectors a USB-C output is added to directly connect the receiver to a Smartphone or tablet and achieve a smooth, stable monitoring (supporting UVC protocol). Another option is having an RJ45 port so as to be able to use Stream RTSP to stream video directly to live platforms such as Zoom, YouTube, Twitch or TikTok along with other IP protocols: NDI|HX, SRT, RTMP and HLS.

• TRANSMISSION PROTOCOL. The most common types are: Wi-Fi 6, 2.5GHz/5GHz/6GHz, LTE/5G, or low-latency dedicated RF links based on closed point-to-point systems (from manufacturers such as Teradek, Hollyland, Vaxis…).

Some wireless transmission kits work with bonding technology (transmission with an added link) that allows the aggregation of different network connections (for example: 3 4G connections, Wi-Fi and Ethernet. This technology maximizes transmission stability and prevents transmission interruption, automatically redistributing traffic in the event of a connection being lost on one of the networks.

It is important to note that regulation within the European Union and Spain may limit the maximum transmitted power (EIRP) between TX and RX, so the manufacturer may declare that their kit is high emission/transmission power (dBm) despite exceeding the legal limits. It is convenient to find out the support (“country code”) for Spain/European Union regarding the legal transmission power.

• TRANSMISSION CAPACITY. We refer to the number of RXs with which you can simultaneously work for each TX, regardless of transmission protocol. In 2025, the most advanced solution supports up to 6 simultaneous receivers.
• LINK TYPE. There are four types: point-to-point (one TX to one RX); point-to-multipoint (one TX to several RXs); bidirectional (interactive TX/RX with remote control); and multi-device (mobile RX with apps or tablets).
• TRANSMISSION RELIABILITY AND STABILITY. Each kit has developed internal systems to prevent wireless connectivity failures and allow real-time feedback on frequency status, ensuring an uninterrupted, reliable and more rewarding experience.

For example, DJI through its SDR (Software Defined Radio) technology supports seamless automatic frequency hopping in on 2.4 GHz, 5.8 GHz, and DFS (Dynamic Frequency Selection) frequency bands. In the event of experiencing an interference, it can automatically switch to the smoothest channel when operating in complex environments with many obstacles.

Also, well-known brands such as Hollyland have implemented their own Auto Dual-Band Hopping technology (2.4/5 GHz) with automatic frequency switching; Teradek, under the Zero-Delay patent; or Kiloview, with Kilolink (on-premises or in the cloud) through bonding technology.

In addition, each manufacturer provides the possibility of establishing different specific configurations between TX/RX for greater optimization in transmission by tweaking  parameters such as signal quality (resolution/FPS) and/or effective bitrate (from 60 Mbps to 3 Mbps), thus adapting to the relevant workflows of broadcast, streaming, multi-camera production or shooting direction.

• LINE OF SIGHT (LOS). Also known as reach, range, or transmission distance. Here we are making reference to a direct and clear path between the TX antenna (camera or video source) and the RX antenna (monitor, recorder, control station).

It is important to make a distinction between declared reach and effective reach. Declared means that information published by the manufacturer on the LOS of a specific model, always under ideal, optimal conditions, permitted legal power, correct alignment between TX-RX and the absence of obstacles and interference.

On the other hand, the effective range is the most realistic distance supported by the TX-RX kit under the specific conditions of each work situation (indoors, outdoors and considering any physical obstacle as well as weather conditions).

We can find a fairly broad field of declared reach, from 100 meters to 3 kilometers, the most common figure being 1,000 meters. And there are even kits that allow the optional configuration of selecting the desired range for line of sight.

Of course, the effective reach is different and always lower than the declared figure. Physical obstacles reduce both range and signal quality, such as: walls, people, trees, metal, smoke, heavy rain,… which can cause decreased signal power, potential pixelation, greater latency, interference and/or a temporary loss between TX and RX.

• LATENCY. It is the total time it takes for a signal or data to go from TX to RX, provided a stable display result without visual compression is achieved. It is measured in milliseconds (ms) or seconds (s), and determines how “live” the image you see from end to end of the wireless video setup is.

A distinction should be made between declared and practical or actual latency, resulting in different data in terms of total time, as was the case with the range of distance. In real-world scenarios (obstacles, interference from other signals, congestion…) latency usually increases.

Manufacturers talk about ‘zero delay’, ultra-low latency or low latency solutions or kits. For example, some latency data to consider based on production requirements: <1 ms for high-end cinema, specifically in situations very sensitive to delay (focus tracking -focus puller-, use of remote viewfinder, synchronization with audio/lip sync, etc.); 10-60 ms for director or production monitor; and >60 ms in streaming productions or secondary monitoring.

• RESOLUTION. We refer to image quality in terms of the number of horizontal and vertical pixels, where UHD and 4K kits can be found and 1080p (FHD) as the resolution mostly used.

In regard to this parameter, it is essential to know the video output format with concrete technical specifications such as color depth (8-bit, 10-bit, 12-bit…), the type of video signal sampling (4:2:0, 4:2:2, 4:4:4,…), frame rate, SDR/HDR and compression codec (H264/AVC, H265/ HEVC, MJPEG, MP4…), which places the wireless video transmission kit at the most professional level (cinema and broadcast), or for portable or streaming solutions.

• COMPATIBILITY and INTEROPERABILITY. Real-time wireless video monitoring kits have to work seamlessly with any capture and playback/presentation/recording equipment to be successful within the professional sector. Therefore, video signal coding and connectivity protocols are the same as those already used in the field of cinema and broadcast (SDI-3G, SDI-6G, SDI-12G, HDMI…) regardless of the type of camera (DSLR, mirrorless, digital cinema, ENG, PTZ, EFP…), mixer, monitors or external recorder.

In addition, some manufacturers maintain compatibility between the different generations of wireless video monitoring models being released on the market. A very beneficial option for investments in the purchase of equipment and for making the most from its use. This is what we call interoperability.

• SECURITY. We refer to working with AES-128/256 encryption, authentication, VPN private networks, free channel selector and spectrum analysis.
• POWER and BATTERY DURATION. Most kits have the option of NP, V-Mount and Gold-Mount batteries, external DC power or USB-C (allowing fast charging -PD Fast Charging- and are compatible with many modern power banks).

Distance/range, latency and image quality are key factors to classify the different monitoring solutions for the production environment

Also worth of note are other extras such as: transmission of camera metadata, very important within the field of cinema between directors, operators and DIT with ARRI and NETWORK cameras; the voice call function favoring real-time, direct, one-to-one communication between the receiver and the transmitter; the switching of TX source in the RX allowing to monitor several TXs; the recording on SD or USB card on the RX with automatic file organization; camera/stabilizer control (PTP -Point-to-Point-) control, the wireless transmission technology that makes it easier to control some camera functions directly from an app, adjusting parameters such as opening, shutter and ISO and even activating the camera’s photo and video recording functions; or having conventional monitoring assistance tools such as LUTs, Peaking, WFM and False Color, thus offering a clearly professional monitoring experience.

Last but not least are: on the one hand, mounting of TX/RX within the professional context and tailored to the solutions already implemented in each work area with compatible shoes and mounting plates (standard thread of ¼”-20 or 3/8″-16, “shoe” type, or clamp, V-mount…) or integrated/modular assembly; and on the other hand, the manufacturing design of the TX/RX being light, resistant, optimized in terms of consumption, passive cooling and as quiet as possible.

2025 presents innovations and new trends that we must assess calmly as they are being gradually implemented: use of optical systems (laser/Lefia) capable of transmitting video without compression with ultra-low latencies in nanoseconds; more software systems (encoders/decoders, stream managers, cloud/edge multiviewers) enable routing, scaling and applying AI (retranscoding, event summary) on lower latency routes; or platforms that allow subscription features to be activated (edge AI, multi-camera, remote MAM).

Each of these parameters and aspects have an impact, but mainly the distance/range, latency and image quality are key factors when it comes to classify the different monitoring solutions available to the production environment:

• High-end or professional. Its domain is film production and the broadcast environment, between the main shooting camera and the needs of the shooting set.
• Mid-range or semi-professional. More frequent in multi-camera production, hybrid production, outdoors and events.
• Low range or amateur. Very significant in the field of portable production, small sets and streaming on live social media platforms.

When it comes to choosing one or another kit, it is convenient to know the choice of parameters offered by each manufacturer. But price is key, given the existence of different solutions to be used, the most expensive being high-end ones (cinema and broadcast) and the cheapest the ones dedicated to portable or streaming environments.

In each of the above-mentioned production environments, it is very convenient to design a wireless video transmission solution that includes use of redundant signals, implementation of ultra-directional gain antennas (panel, ‘cloverleaf’ or helical) as well as backup links and spectrum analyzers to minimize the existence of errors, cut-offs and interference.

Despite the dominance and expansion of Teradek and Hollyland in the audiovisual, broadcast, film and live sectors, there are other companies that have developed very representative and competent models:

• Teradek: Volt 6 XT / LT / Monitor Module / Ace 750 / Ranger Series
• Hollyland: Pyro5 / Pyro 7 / Pyro H / Mars 4K / Cosmo C2
• Vaxix: Storm 3000 DG / Storm 1000XR
• Accsoon: CineView 4K / M7 / M7 Pro
• Atomos: Shinobi 7 RX
• Swit: CREW 1.2km/3km MAX
• DJI: SDR Transmission (O3 Pro)
• Kiloview: P3 Mini
• Cinegears: Ghost-Eye 800M
• Lilliput: WS500
• Krieg: TR-10
• Dejero: EnGo 3x, 265, 263
• LiveU: LU900Q / LU810
• TVU Networks: The One

In each country, 5 GHz, 6 GHz or other bands are regulated in various aspects. Thus, we can find that a kit works very well in the US but finds itself limited in Europe

Other manufacturers with a lower market share but very important to take into account for tighter budgets are: Smallrig, Eliview, Camtronics, Feel World, Mqv, Godox, Lensgo, Rode, Saramonic, Zhiyun, Smallhd, Dwarfconnection or Wooden Camera.

All solutions and kits have made it possible to achieve freedom in video connection without cables. Wireless real-time video monitoring systems are one of the most widely used pieces of equipment for film directors, or Focus Puller / 1st AC, Video-assist, DIT station, recorder, mixer or customers who need to monitor the live signal in demanding shootings, live events, streaming, professional video production, multi-camera to reference monitors, recorders, control stations and/or on live social media platforms.

We cannot conclude this article without mentioning the legal aspect that covers spectrum regulation. For example, in each country the 5 GHz, 6 GHz or other bands are regulated in aspects such as: allowed for free use, with DFS restrictions, maximum power, channels allowed… Thus, we can find that a kit works very well in the US but their performance may be limited in Europe or Spain under different regulations.

In Spain, the regulation of radio spectrum frequencies, which include real-time wireless video monitoring systems, is mainly the responsibility of the Secretary of State for Telecommunications and Digital Infrastructures of the Ministry of Economic Affairs and Digital Transformation. The basic regulatory framework is the National Frequency Allocation Table (CNAF), approved by ministerial order that defines which frequency bands can be used in Spain. In addition, the National Commission on Markets and Competition (CNMC) performs a supervisory/regulatory role in the field of telecommunications.

The “2033 Wireless Video Streaming Systems Market Research Report” (source: https://growthmarketreports.com/report/) portrays an increasingly broad and diverse market in applications such as broadcasting, surveillance and security, commercial, industrial, residential, and other specialty uses.

Nowadays, versatility, portability, stability and high sensitivity/precision are the big advances that wireless video transmission kits have experienced, either under Wi-Fi, RF technology or manufacturer proprietary protocols.

Professionals for AV and broadcasting are well aware of the benefits of working wirelessly, but under implemented and tested solutions to ensure that the results are the best.

We already left well behind the stage of doubts, errors and interferences. Wireless video monitoring in real time has become a practically essential, pretty fashionable solution featuring simple configuration and easy operation, which can be summarized in four actions: turn on, pair, transmit and display.

Nowadays, versatility, portability, stability and high sensitivity/precision are the great advances that wireless video transmission kits have experienced