FFD, you should have gotten a Humminbird and then you wouldn't have that problem. They are "plug and go". LOL
That powered antenna deal has been a trouble shooting headache since it was incorporated. Interference with the display if too close, dead battery from being non-switched, blown fuse on the power hook-up, failure to provide power, etc.
OH, didn't you know that it might not work correctly if it is closer than 3' to the display? Just one of those "omissions" in the manual that recommends the placement to avoid "possible interference".