Roger Halstead wrote:
The " system" gets hit about 3 times a year on average.
http://www.rogerhalstead.com/ham_files/tower.htm

Interesting site. However the links to your larger pictures are all broken.
They refer to files on your local PC eg:
file:///C:/Documents%20and%20Settings/Administrator.ROGER2.000/My%20Documents/My%20Webs/ham_files/tower8.htm

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73 Laurie - G6ISY