This is what I have and it works great. Never had a problem with it.
http://www.basspro.com/Cobra-MR-HH12...duct/10223893/
I had 2 of these.
http://www.basspro.com/Uniden-Atlant...product/52738/
The first one I did not attach to a leash and it's now resting below the bait barge in San Diego bay, and the other one the antenna wasn't all the way tight and water got into it. The new radio I have which is the top one works as it should and never had an issue.