I agree, it could be the antenna itself, they are known to crack and stop working. I had my sent back to the manufacturer and replaced and now it works perfect. As for 1St Grady's location, my location is similar, I mounted it center line on the dash, once in a while, maybe 1 trip a season I will have issues getting a gps fix, after doing research I found that the windshield metal can block the gps satellites from reaching your antenna. If I were to mount the antenna again or on a new boat, I would do as freddy mentions, buy the extension and mount it like your vhf antenna is. You will place it high and with nothing interfering with it, well worth the money IMHO. One of those days I had issues was in fog....not a fun day.