Topband: Radials over a stone wall

Herb Schoenbohm herbs at
Fri Aug 10 09:15:42 PDT 2012

On 8/10/2012 11:17 AM, N2TK, Tony wrote:
> I shunt feed my tower for topband. I use variable vacuum caps and a vacuum
> relay at the base to switch between the low end and the high end of the
> band. It seems to work okay. I have 100' buried radials spaced 10' at the
> ends from o degrees going clockwise through about 220 degrees. I have a 4'
> high stone wall that runs about 20/200 degrees that is about 35' at its
> closest point to the tower. So the radials are progressively shorter on the
> West side of the tower.
> I am making an assumption that going up over the wall will distort any
> benefits of extending the radials on the West side? Is that a true
> assumption.
> I can't really have the radials go from the tower base up at an angle to
> clear the stone wall and continue on. If I am to extend them the radials
> would have to go on the ground to the wall then up and over and back down to
> the ground.
Tony,  A long masonry drill used in the cable TV industry (which has a 
hole on the pointed end to attach the wire and pull it through the wall, 
is your best option in my view.

Herb Schoenbohm, KV4FZ

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