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I don't think anything was wrong with the first  so-239 ( Wilson ), but I couldn't take it apart to see what was under that black cover. That's some hard material. Couldn't get it off without destroying it so I put a different type so-239 on it.  Some one posted some different  photos and it was one of those ( road pro  rp-302MAX  maxi stud.  I think removing the 4" spring and putting those radials on did the trick. At first I thought if a whip worked on a mobile it should work on a pole but I wasn't considering the ground plane effect.