The tuning... dunno.. The typical run of cable out to the rudder and back is pretty long.
I've flown slopers with truncated receiver antennas (cut off by some miscreant trying to knock my plane out of the air while I was intending the same to his... ). and not noticed any range problems with about 1/2 the antenna left.
On my Skeeter HLG, the total length from receiver to rudder and back is over 40".. the usual antenna is shorter than that.
Once a plane gets more than 20° above the ground plane, range essentially goes past the visual limit.