One dilemma I encountered was choosing the frequencies of my data and video links. They must be different to avoid interference, but I still want the most range possible.
Early on, I considered the DragonLink system for the data link. It operates in 433 MHz bands and is designed specifically for rock-solid, low-latency RC airplane control at huge ranges. However, communication is only one-way and it's expensive at $270.
I chose to use 900 MHz for data and 2.4 GHz for video. There are a lot of cheap off-the-shelf modules available for both. 900 MHz should theoretically offer better range, so hopefully the link will remain intact even after the plane goes out of video range.
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