I Have been shopping for a gps fishfinder combo for my new 05 Trophy 2002. I have decided to get the Lowrance LMS-337c DF. My problem is Lowrance only comes with an exteral antenna and I dont have a hard top to mount it. I was was coming close to buying a similar Garmin unit that had an internal antenna but did'nt like the detail. That is one nice thing about garmin is they have the internal antenna. Where is the best place to mount my external antena?