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Here is my (possible) solution, use walkie talkies. You can get some quite cheaply which claim to have 1 km+ range (0.6 miles-ish) , and I am prepared to do whatever is necessary to convert them into radio modules. I have good experience with soldering and circuit assembly, so this could be possible, no?
How much does one of these PMRs cost?
If the range is 5km in open terrain, what would the range be a suburban housing estate, if you have any idea ?
What kind of protocol are you talking about?
Also, what kind of circuit would I need at each end apart from a transistor and a microcontroller?
Use two sets of walkie talkies on different channels.
Just had a thought... what about a microwave transmitter? Would that do the trick? i believe its what the army/navy/elite team of rc car driving ninjas use for their robots... -HyperNerd
Yes, the range is measured for the US output power. Though the international range values aren't listed, we suspect they would be approximated 75% of the US module's range.
While I'm shopping, what else would I need to use these? I'm thinking antennas, breakout boards etc.