Put in the best antenna you can get that won’t get in the way. If you have a nice place such as in front of yet close to a windshield that wont get tangled in anchor lines from cleats etc the I would recommend a standard telescoping. You could go with a powered telescoping antenna that comes up when the radio does, or a manual that you raise or lower by hand.
If the mounting location is prone to getting beat around a bit, go with something flexible. While it won’t pull in as well as a telescoping, it will take a beating.
I love listening to music or a ballgame when I fish.. unlike 1/2 the guys on the site will now never want to fish with me . When I installed a new radio I went with an XM model. The XM is nice because being satellite you have more than 100 stations of music that is crystal clear digital across the entire country, regardless of body of water, foliage, or terrain. Another bonus is that the XM antenna is only about 3 inches tall and 3 inches round which can certainly be placed out of the way. The downside to XM is that it runs $10/month. I run it only during the summer months and it works great.
Additionally, a few more things about marine audio. If you don’t already have a faceplate with gasket for your radio (head unit) it’s well worth buying one. There are many brands, here’s an example…
Metra Marine Radio Cover
The neat thing about these is not only the water tight protection but also the clear faceplate. If you purchase a radio with a remote control, the remote will shoot through the panel with the radio covered. This is very nice in the rain. Many days, I’ve sat in the back of the boat with the remote in the pocket of my rain gear.
Finally, the last consideration is MP3 compatible radios. Some XM’s are also MP3 players. This means you can make your own CD’s each carrying 100-150 songs per disc and listen to what you want, when you want. I carry about 15 discs in my boat that are loaded by genre… Country, Rock, Motown, etc.. Just an idea.
I know that’s way more that you asked for but you brought up something I love.
Hope that helps,
jon