The TVUPack Mini uses multiple 3G/4G/Wifi connections to transmit HD video taking the place of more expensive 2.4GHz Wireless units. It has 8 USB data card slots and can even become it’s own hotspot.  The transmitters sell for around $6500and feature a small confidence monitor and the receiver is around $10k. You can remotely monitor the cameras and the combined signal strength of the transmitters.