> Its certainly possible in VHF/UHF, though (for licencees). >You're welcome to do 256QAM in the microwave range, for example. Which gets back to line of sigh

> Its certainly possible in VHF/UHF, though (for licencees). >You're welcome to do 256QAM in the microwave range, for example. Which gets back to line of sight propagation (tropo is not common) and everything I said in my first post. I've tried the home to car omnidirectional link thing on 902-928 MHz. All that matters is line of sight. I tried a 25w bidirectional amp (ham general license) and that didn't help. I tried bringing the ubiquiti transceivers w/broadband hamnet firmware all the way down to QPSK modulation and the narrowest channel I could. I even tried using narrowband 56k telemetry dongles. I customed designed and built my own microstrip based filters for the front ends. The only thing that really helps, and it's not enough, is height above terrain. When I go park my car on the hills outside of town megabits are possible. But the slightest hill or valley losing LOS kills it.