Topband: 160 shunt fed tower update

[Steve London]

On 01/11/2013 04:32 PM, ZR wrote:

> I dont know what you are using for 80M Steve and why all the feeds, etc
> are located at the top of the tower.
>
> In the 80's I had a 100' Rohn 25 with a stack of yagis and shunt fed on
> 160 which worked well once I went to 4' x 50' galvanized 2"x4" rabbit
> fencing running from the base as spokes and with lots of interconnecting
> wires between the sections.
>
> Then I worked on improving my 80M signal with an inverted vee, 3
> switched slopers and a delta loop.

It's all about topography for me. I live on a hilltop in SW NM. It's 
nothing but rocks and essentially no ground moisture. However, in most 
directions I have 400 feet of dropoff within 1/4 mile. At the top of the 
tower I have a 2 element wire beam on a 34 foot boom, switchable NE/SW. 
Orthogonal to that is an inverted-vee oriented SE/NW. With the dropoff, 
I suspect the effective height is much more than 100 feet, so horizontal 
polarization, with reduced dependency on the crummy ground, works well.

73,
Steve, N2IC