Hello everyone. I am working on a unique design problem and would love some input from people with experience.

I am trying to design a system that relays analogue FPV-feeds (and RC) from 5 individual Fixed-wing FPVs through a singular relay drone. The idea is to achieve 100-200 km range by having the relay drone fly at 2000-3000m altitude, and relay the signals between the GCS and FPV-drones flying at lower altitude. Looking firstly specifically at the FPV-transmission and seeing if this issue can be solved in an efficient manner, or frankly if it can be solved at all.

I understand how a relay drone and single FPV-drone system could work. For example:
FPV-drone: Camera feed -> 1.2GHz VTX (1010MHz at 400mW) -> Omnidirectional Antenna
Relay-drone: Omnidirectional Antenna -> 1.2GHz VRX -> 1.2GHz VTX (1010MHz at 2W) -> Directional Antenna
GCS: Yagi Antenna -> VRX -> FPV-goggles

Relaying 5 different FPV feeds simultaneously seems much more difficult however, and I can't seem to find other posts in forums about this specific issue. Maybe it's not feasible?

Currently, my understanding is that I will need 5 different VRX modules in the relay drone, each with a separate receiving antenna and each set to a specific channel. These 5 VRX outputs will then have to go to 5 different VTX modules, set to the corresponding channel, to amplify the signal. The 5 outputs can then be combined with an RF combiner and output in a single transmitting antenna.

At the GCS, the received signal can be split by RF splitter into 5 outputs, which then goes into 5 different VRX modules set to the corresponding channels, which will then display the individual feeds to 5 different pilots.

My understanding is that this setup could be functional, but it seems clunky and power hungry, and perhaps the modules would interfere with each other. Or would this setup not be functional at all due to interference or some other technical issue? I think the 5 VRX modules with individual antennas are necessary, but perhaps there is another way to do the amplification and retransmission? Are there any VTX modules that transmit several channels simultaneously, or any other way to amplify the 5 outputs from the VRX modules without the use of VTX, for example RF broadband amplifiers?

I have experience in aerodynamic design but only recently started learning about radio technology and FPV. Would highly appreciate input, reading and theorizing only gets you so far.

Best regards,
Olof