last few times out my radio has had a lot of static when i turn it on. i thought it was just someone holding the key of their mic down the first time it happened. but yesterday, i turned it on and had the same static. it only does it on the ship to ship chanels, weather channels come in find. i turned on my handheld yesterday and there was no static on it while i was getting it on the onboard radio. its a new radio and antenna, i just got it last year and have had no problems with it until now. anyone have any ideas what to check? thanks for any input.