Range Problem
John,
I had a similar problem with my P120 powered Roo. I flew mine with only about 20' of range with the antenna removed. I forgot you were supposed to check it with the antenna out. The flight went fine until I was on final and the RX went into failsafe. Luckily it wasn't hurt too bad.
I bought a crimper and the connectors so I could shorten the data cables. I also installed ferrite rings on all the leads that plugged into the ECU.
You might want to try a different RX, just for grins. Everything I did helped the range some, but the 2 things that helped the most were switching to the revolution whip antenna and switching from a JR 910 RX to a JR 945 RX .
Now with the P120 running I get a little over 1/2 a mile with antenna extended and 150+' antenna removed.
BTW ......Bob Wilcox and Matt were very helpful.