I'm too chicken to try this. Where I live, there are a lot of canyons and hills. If my setup limits AGL height to 400', what happens if I put the bird up to 400' above me at my location, then fly it over a 800' deep canyon? Will it maintain altitude, or drop to 400' AGL, which might be 600' below me, and possibly under a treeline in front of me where I would lose signal? Or will it maintain altitude?