I'd be inclined to review the work of others to get a sense of the complexity and component cost of various approaches. In posting to this forum it does seem that you agree with this approach. I've seen, but never used, the 433 mHz modules - transmitter or reciever. It would seem that this could greatly simplified the task of building a data relay station.
Unless you are working with the modules described you may find that working at UHF is rather demanding in terms of skills - design and construction. Even at FM broadcast frequencies circuits can be very sensitive to all sort of things. If you've not done it - start with something simple at lower frequencies/low power to get a sense of what I mean.
You will find a lot of general RF transmit and receive information in amateur radio publications and literature. ARRL, American Radio Relay League or RSGB, Radio Society of Great Britain are two places to look. Those groups, among others, use all modes of communication.
Good luck.