RE: AR500 Thoughts ?
rmh, I must correct your statement. (I was going to let it slide the first time) The AR500 is a 5 channel receiver with a 6th port, as a "Y" for the ailerons.
I have a few, at least three in use. I often mate the fifth channel as 2nd aileron in my 9303, 9503, or 12X to take advantage of aileron differential. I never use the 6th port, other than possibly a second battery input.
As for advise, I would recomend the AR600 over the now discontinued AR500. The antenna configuration in itself is well worth the newer design.
Hope this helps,
-Snuts-