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Same area; way bigger moment arm. We have put 2' and 3' antennas
into concrete. We used solid standoffs (like
this), and IIRC, we used 5" long concrete anchors.
bp
<part15sbs{at}gmail{dot}com>
On 8/16/2018 2:00 PM, Adam Moffett
wrote:
A 20' long rectangle 2 inches wide has slightly less square area
than a 2' dish.
If your mount is comfortably holding a 2' dish then it ought to
hold the 20' omni.
Not engineering advice, just an observation about geometry.
-Adam
On 8/16/2018 4:51 PM, Colin Stanners
wrote:
So our amateur radio "Wi-Fi" (+similar protocols) group
has gotten access to the roof of a large building where we
plan to install mounts outside the walls of the
concrete-walled elevator shack for our smaller antennas.
Does anyone know if having the above pair of mounts
lag-bolted (2 inches deep?) into concrete is strong enough
to guarantee no issues with that huge antenna, or would we
need to drill through the concrete and put a plate on the
other side instead?
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