I was very disappointed with the results of the marine
kit. I didn't get as far as installing it but in testing in an open area I didn't think it really added to the performance. The guy that owns this place www.mjsales.net
seemed to be pretty knowledgeable. I was going to try an antenna recommended by him but ultimately just used it from our nav station. If signal was sketchy like when I was trying to down load a large weather
data set, I put it under the dodger
. That worked fine for us. I also never had much success using the voice calling mode. Maybe that was due to not having a good external antenna. Again, it wasn't something we really needed.