OK, on start up just point the GPS antenna that is sitting beside the plane to due North. That way it now has a directional refeerance and a gps pin point ont the ground.Well, for such a contraption to work decently, the base station (your control box) would not only have to know it's GPS position, but also it's orientation (which direction it is facing) fairly accurately; within a few degrees.
If the A/C were within a certain distance (say, 100 yards) you'd want to switch to an omnidirectional antenna, as otherwise the antenna may lag behind the A/C's current position.
Sure would be easier to just have the antenna mounted on your control box
Ya, I was actually thinking about switvching to the omni about 2 or 3 Km out the Omni is good for more than that.
About one of your other posts. I am well aware that there is a high load of 900mhz traffic aound my area but for some reason I have not had any problem. One the plane and the base station get a lock on each other I have had it out to 5 km with out lose of signal.
The IP guys around here use 911 and 915 for the tower transmitters and North of me the oil companies go nutz with 900mhz transmitters from the oil and gas wells back to the control station. The only thing that I can think of is that we use a Spread Spectrum 1 watt modem and these other guys are using less than 1 watt ISM radios on specific channels. We do know that if I get to close to houses with wireless internet we can interupt their signals.
Robert