#Hollyland Syscom 421-4TX, 4x Transmitter, 1x Receiver, 25x Antenna, 4x Arm Mounts

It looks like you are listing the exact inventory for the Hollyland Syscom 421S (4TX to 1RX) Wireless Video Transmission Bundle.

This is a powerhouse setup for multi-camera live productions, sports broadcasting, or live streaming. That high antenna count ($25\times$) often catches people off guard, but it's completely correct for this specific package.

Here is a quick breakdown of what this kit gives you and why it’s configured this way:

System Breakdown

• 4x Transmitters (TX): Each camera gets its own dedicated transmitter. They support both SDI and HDMI inputs and send uncompressed 1080p60 video up to 1,800 feet (550m) line-of-sight.

• 1x Receiver (RX): A single central hub that receives all 4 video feeds simultaneously on one RF channel. It features 4x SDI outputs and 4x HDMI outputs to route straight into your video switcher or production monitor.

• 25x 5GHz Antennas: Both the transmitters and the receiver require 4 antennas each to operate (4 antennas x 5  20  antennas in active use). Hollyland includes 25 in this specific bundle to ensure you have 5 backups on hand for the field.

• 4x Arm Mounts (7-inch Magic Arms): Used to securely mount each of the 4 transmitters onto your cameras' cold shoes or cages via 1/4"-20 threads.

Production Features Built-In

• Ultra-Low Latency: Clocking in at just 0.07 seconds, keeping your cuts tight and in sync during live broadcasts.

• PTZ & Tally Control: It passes RS422/RS485 control signals and Tally indicators back and forth through the wireless link, meaning you can control PTZ cameras remotely and trigger "on-air" lights seamlessly.

• RTSP Streaming: The receiver has an RJ45 LAN port, allowing you to push or pull direct network streams for local monitoring or web streaming.

Are you getting ready to deploy this rig for a specific project, troubleshooting a setup, or putting it up for sale/rental?