Hi Gus,
I'm interested to see if twisted extensions work but to be honest I doubt they will. I have been speaking to Ben Werner of Mutimode Technologies who make a small filter unit which connects between the ESC and the receiver in electric models to stop noise entering the RX via the ESC.
I have asked Ben whether his filter might do the same for long servo leads and he is optimistic that it will. As you will be using a separate receiver battery and don't need a BEC connection through the filter unit you can use the LC version which only weighs 2.2 grams. I assume you have two sets of leads from separate channels in the Rx so you will need a filter in each lead.
You can contact them here and the good bit is that if it doesn't cure the problem you can return the unit for full credit.
http://www.multimodetech.com/index.p...tpage&Itemid=1
Hope this helps when you get fed up with a daft whip aerial sticking in your eye!
Cheers
Malc