Get a smaller one than that gay mushroom and install where there is no vertical obstruction. The pic is where ours is.

Waterheater you might want to try your location before drilling, windshield and throttles in the way might make interference.

two are below the deck and two are above on the inside of each canopy.

i would mount yours right under the gunwale.

43 Thunder - My vhf antenna is mounted outside by the helm.

Audacity - Loks like if I replaced my dgps antenna with my gps antenna the setup would be similar to your mounts next to the canopy. Do you have any problems with reception?

GL - mushrooms are gay? I would rather not drill a hole thru the top of my deck... good place for water to leak and cracks to start from.

Then since the wires are all ready on the other side mount it there. My Sonic used to have the VHF on the starboard side and the DGPS on the port side with the GPS antenna mounted on the dash

To remove the existing antenna I would need to remove completely because the cable is hard wired to the antenna.

If the antenna would work fine on the outside of the gunwale would it work just as wekk on the insie of hte gunwale where my existing dgps antenna is mounted?

i'm talking completely under the glass in the gunwale...few inches from the top...out of sight.

Being under the fiberglass won't attenuate the signal?

nope...we have 4 separate GPS's in the boat and sometimes 5...but that's only while running a laptop (CRAZY fast acquisition!)....2 are above and 2 (sometimes 3) are below. they are all (calibrated)right about the same...maybe the old ones would have a problem??? never tried installing below on anything older than 2000. zip tie it up in there....sea what happens!

Yeah i may have to find another spot for the gay mushroom. It looks as though it may be too close to the windsheild. Dont want that turning gay on me either.