I have a 50 Ω VHF airband antenna which I’m planning to install in my loft, for use with a RaspberryPi-based RTLSDR scanner/receiver.
I already have a UK-standard UHF/Freeview antenna using standard 75 Ω coaxial cabling running from the loft into the lounge and want to make use of this rather than running new cable.
I am not planning on transmitting on the VHF band, and the antenna will only be used for receiving/monitoring UK airband traffic.
Am I correct in thinking that:
Running two antennae for two diverse frequency bands across the same coax is OK, providing that both antennae are RX only
I will need a UHF/VHF diplexer on either end to suitably merge/split the signals from each antenna
The loss resulting from using a 50 Ω antenna and a 75 Ω antenna/cable is negligible enough to make the setup viable