I guess the first thing to try would be to reorient your antennas. I'm assuming your transmitter's is cocked at a 90° angle to the side. You could also move your RX and/or try different combos/arrangements of it's antennas. Try to get them out in the open. Folks usually keep them at 90° to each other, one up/down, side etc. The point being to always have one not blocked at any time while flying and maneuvering (overhead, away, pitched etc.)