In article .com,
wrote:

Some nice photos:

http://ala1530.hobby-web.net/user.html

If those are metal masts going through the loop area that is not a good
idea. I understand the desire to provide the support for the loop
mechanically but the metal mast will screw up the loop performance. A
non-conductive mast should be used.

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Telamon
Ventura, California