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I have seen this and solved it many times. While every situation is different, usually the problem has to do with common mode currents along the feedline more than anything else. You can ground everything till you are blue in the face, and also add ground radials which on this type of antenna (not a ground plane) will probably not do a whole lot.

Personally, I would change to 9913 coax, so it is shielded well, and then take 6 turns of it right at the bottom of the antenna feed point and make a small choke reducing common mode currents. You could always buy a common mode filter, but at that point, you would probably be better off with a new antenna system.

[QUOTE="JustinDePolis, post: 368660, member: 9760"] I have seen this and solved it many times. While every situation is different, usually the problem has to do with common mode currents along the feedline more than anything else. You can ground everything till you are blue in the face, and also add ground radials which on this type of antenna (not a ground plane) will probably not do a whole lot. Personally, I would change to 9913 coax, so it is shielded well, and then take 6 turns of it right at the bottom of the antenna feed point and make a small choke reducing common mode currents. You could always buy a common mode filter, but at that point, you would probably be better off with a new antenna system. [/QUOTE]

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