[TowerTalk] Fwd: Fwd: 160m T vs. Inverted L

[Jim Brown]

On 8/21/2017 11:53 AM, Joe Subich, W4TV wrote:
> hat is installed on the top of the 115' tower?  At 115' it's quite
> close to resonant t0 2 MHz and any significant top loading (mast,
> antenna booms even with insulted elements) may move the resonant point
> down to 1.8 MHz or lower.  It will most certainly couple heavily to
> the inverted L and will seriously impact performance.
>
> Given that you can not get the vertical part of either a "T" or inverted
> L more than 30 feet (0.06 wavelengths) from one of the towers, I would
> expect coupling to be significant unless you can detune both of the
> towers.

Good thinking. I'll add a very different suggestion that works for me. 
My tower is roughly equivalent. The solution I chose was to rig two 
wires sloping away from the tower to a feedpoint about 60 ft away. One 
goes to 70 degrees, the other to 270. They are suspended from opposite 
ends of a 10 ft length of 4-in PVC conduit that sits just below the 
rotator. The wires are fed separately at the base against 4 radials 
elevated about 20 ft. The tower acts as a reflector, yielding about 2 dB 
of gain. It's grounded, but I've added 8 on-ground radials to reduce its 
resistance.

73, Jim K9YC