I live in Australia, and ordered a concentric coil for my F5 11 months ago....after me phoning the dealer here several times over the last 11 months, I finally received a message from him on my message bank that there is no concentric coil for the F5. I know that his information contradicts the information in the F5 Operator's Manual, and I know that the concentric coil used to be the standard coil on the F5 (mine came with an 11" DD). First question: Is he correct? Second question: Can I use the concentric coil from my Omega on the F5 (they both seem to have the same operating frequency). Certainly wouldn't mind if Dave J. came in here with some info. Thanks all, for any feedback.