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I mounted the antenna with the included strap and bought an additional strap from Home Depot in the plumbing section for about $1. The straps don't do a lot to hold the antenna in place -- that is mainly done by the nut.
So, with the OEM grommet in place I poked the head of the antenna mast through and placed the spacer from the kit in it. After that, I squeezed a bunch of silicon sealant in it to keep water out. I also purchased a 3/8" washer from Home Depot and enlarged the hole to 1/2". I then put the 1/2" washer on top and tightened the nut.
I then crimped some low voltage connectors from a Harbor Freight kit on the OEM conductors and cleaned up the system.
The end product looks fairly stock, although I would still notice it as I notice lots of details on Mercedes. I tried pouring water through and did not see any of it coming through on the inside.
It would have been nice to know how to do this beforehand, but I am pleased with the install and it works well.
Dkr.
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