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Dave, please provide a bit more information. First, what transmitters do you have (just the two or more on the ground), and what receivers? Where are each located? Are the two transmitters with antennas 6" apart operating on exactly the same frequency, or are they separated by some amount?
A simple test might be to separate the two transmitter frequencies by some amount. Video is a wider bandwidth application than telemetry, so you're going to have to account for that by using enough frequency separation. As far as GPS failing, perhaps you're overloading the GPS receiver with the two 900 MHz transmitter signals. The GPS receiver might not have enough out-of-band rejection to reject signals outside it's normal operating range of ~1227 to 1575 MHz. Increase the distance separation between the transmitters and the GPS receiver, or you're going to have to reduce transmitter power, or add some additional filtering between the GPS antenna and the GPS receiver.
Good luck with your project!
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Jim R.
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