Topband: 1/4 wave vertical

[Donald Chester]

>Full-size 1/4 wave with Rohn 25 -- about 11 inches on a face -- is about 
>128 feet tall. Your tower should be pretty close to that, maybe slightly 
>taller. Common method is to put up 120 feet of tower and then make the 
>remainder a piece of aluminum tubing clamped to the tower, and adjustable 
>up/down to resonate the tower.Fastening with a couple of hose clamps will 
>work.
>
>My Rohn 25 for 160 is only 100 feet, and I have a small 6-meter yagi on top 
>that brings it into resonance on 160.


Use a base insulator with the tower, and with series feed it takes only a 
simple L-network to make it match perfectly at any frequency.  Mine is 127' 
tall, with 120 quarter-wave radials, and works the entire band 1800-2000 
kHz.

Don K4KYV

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