- Some photos of an HD-70 Tower installation in Northern Maryland.
main job of this tower is to support wireless data communications between
office buildings in Hagerstown, Maryland, however it also serves double-duty
support an HF triband yagi antenna.
I spent a few hours at this jobsite, and I was impressed at the simplicity of this
with a 120 VAC drill used to drive a small pulley through a reduction
This was used to raise several items to the top, including the HF antenna.
twin mounting plates are now in position, along with a 12' mast. It's barely
in this photo, however the upper mounting plate also has a 30" support
welded directly to the plate to support a small grid dish antenna.
A few photos now of the HF tribander being raised. The two ropes running vertically
used as slide ropes for the yagi to ride on, while the gin pole rope did the lifting
the center of the antenna mast.
I personally took this photo while doing some final tightening and antenna aligning.