I've got both aerials on the roof, but instead of using 2 cables to my lounge, is it possible to use a combiner and spliitter that don't require a power supply so I can use on ecable for both supplies?
Also in loft you will need see here There are many more options which include boosters etc. But basic to send two or more RF signals on different frequencies you can combine them and split them but if on same frequency you need separate cables.
You could use same unit both ends they will combine or split.