Tried it, doesn't work. Here are my findings:
-If I run this wire behind the weatherstrip, it lose reception. I tried both weatherstrips (the windshield and the door). I even tried running the wire through the door weatherstrip all the way to to rear door with no luck.
-if I attach a wire and hang it off the fender, I get as good reception as having the antenna on but can't drive around with a wire flapping in the breeze. I tried dropping it behind the fender, sliding it under the plastic trim of the windshield to no avail.
-if I touch the post, reception is great bc my body is acting as the antenna.
The whole experience reminded me of old home stereos I had where you had to keep messing with the antenna wire to pull in stations.
In the end I had to put the antenna back on.