Topband: Tower insulator thickness?

[Jon Zaimes AA1K <jz73@verizon.net>]

I'm planning on using some insulating material under BPC25 and BPC55 Rohn base 
plates (and around the pier pin in the center) so the towers may be series-fed 
on 160.

Is 7/16-inch thick enough for this purpose?

73/Jon AA1K

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