Here in Seattle, it's hard to find anyone stocking antenna parts. I would consider trying the RS hardware after putting a few coats of outdoor enamel paint on them.

It sounds like RS is offering something like this: http://www.amazon.com/RCA-VH123N-Ant...=mast+brackets

Connector boots don't seal as well as this: http://www.amazon.com/Scotch-50727-B...h+sealing+tape which I have also purchased at Home Depot. I put a couple wraps of black electrical tape over the 2228 to protect it from UV rays and dust/dirt which sticks to the tacky surface of the 2228. Products such as Coax-Seal are equivalent.

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http://antennacraft.net , most likely has the replacement hardware.