Manks, You will experience no noticeable signal loss.
I say "Noticable" because you may lose 5 or 10 feet of signal, but you'll be so far away that you won't be able to see the plane anyway!
I do product reviews for RCU Magazine, so I am constantly pulling a radio out of one plane and putting it into another and this is the best way I have found.
As far as any loss of signal, I often tell two stories:
The first one was when I was flying an old plane that I had pulled out of storage. During the flight I got a few "Glitches" so I decided to cut the flight short. I landed, and when I removed the wing I realized that the antenna was still wrapped around the receiver!
The second story was when I was reviewing a Seagull Edge 540. The maiden flight was great, so I decided to shoot the video right then and there. My buddy put it through its 3-D paces, and after landing I realized that the antenna was just laying inside the radio compartment like a big rat's nest. Never even got so much as a glitch.
So I'm not worried about leaving a few inches of antenna laying around.
And if anyone is wondering, here's the review: Scroll down to the video section to view it.
http://www.rcuniverse.com/magazine/a...article_id=706