Installation of a Radio Shack outdoor FM antenna
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Because the Radio Shack brackets lack a weight-supporting arm on the 8" bracket sets, I modified one of the brackets to use vertically at the bottom of the mast.
Mounting this bracket vertically and having a sawed-off broomstick end inserted into the bottom of the mast tube provides a sturdy support for vertical forces. The broomstick is a guide pin for the mast so it won't slip off.