I would get 2 pieces of 2"x2" angle x 5' length, 2 pieces of allthread and drill each angle, using allthread to clamp down against the chimney making a good solid mount, of course the antenna will go at the end.
If done right and your chimney is not crumbling to pieces I would trust this setup to support my own weight.
like this
|
chimney |
xxxxxxxxx |<---antenna
xxxxxxxxx |
==========<----drill angle and attach antenna with ubolt or saddle
xxxxxxxxx |
xxxxxxxxx |
========== <---angle
xxxxxxxxx |
side view
xxxxxxxxx <-chimney
xxxxxxxxx
|--bolt---L<---angle (drilled for bolt)
xxxxxxxxx
xxxxxxxxx
|---------L
xxxxxxxxxx
another good option would be to use wrap lock or banding, even giant hose clamps joined together would work, but I doubt any of these are readily available at your local hardware store.
Is how we do it in telcom