Trying to recreate analog broadcasting.

[Dubis7]

I see a lot about agile modulators, and I understand that you can broadcast one source over a local area for wireless pickup. It sounds like each modulator can only send one source on one channel, though, and changing the source has to be done on whatever is sending it to the modulator.. I'd like to broadcast multiple channels so I can tune from my television itself, rather than having to select the pickup from the modulator source. Is there a way to pickup, modulate, and broadcast a wide selection of channels? Possibly into the uhf range?