That's a really good suggestion.

It is probably much cheaper than the Andrew stand-off model 11662-3. You
can get them from TESSCO for about $28 each.
Based on the price I would look around hamfests etc for pieces of ceramic or
use the PVC with insulators from Agway. A flat piece of metal with 3
holescan be used for the anchor. The middle hole is where you attach the PVC
etc. Like a sideways "T"

mc