Top of the tower is best. Since I have lights and speakers on my tower, I was'nt about to try and run the XM antenna wire through the tower, so my second choice was at the base of the windsheild. This worked but when the boat was facing a certain direction the signal would cut out, so I wound up puting it on top of my Nav light at the front of the boat. It's a closed bow also so no one is ever near the light and it works great, no lost signal now. The reason for attatching to metal is to help attract a stronger signal. I used two sided tape to attatch it. Most people don't even notice it's there till I point it out.
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