Took off with great satellite signal, got to about 80', then immediately went into weak signal warning and took off away from my location. It was in clear line of sight. The trees are on a steep cliff, and no visibility to the top of the canopy. I have a general idea of where it is, but have not been able to sight it. Tried repeatedly to regain signal with the controller, while under the trees, but no luck. Will try to find it again tomorrow, but I'm resigned to the fact it's gone.