"Scott" wrote in message
.. .
Some commercial towers mount similar, but the ones I've seen have a fairly
large peg sticking out of the concrete and mates with the tower base and
the guys hold it all in place.

Scott

Some of these are vertical radiators that need to be insulated from ground.
I have seen pictures of such where the tower actually came to a point at the
bottom (WLW?).

Tam/WB2TT