[Antennas] 160 Antenna

[Chris Boone]

You COULD tap the tower up one leg for a gamma match (either a 90deg or
sloped wire connection; I know of a couple of AM that use grounded
towers..some with a "gamma" match OR others using outside ring of wires for
folded monopole...like a DB201 ground plane)
In this case, you would have to run a large radial system for RF
gnd/counterpoise....Matching it at the high spot allows antennas/coax to
stay on the tower while also feeding it with MW RF...How tall is the
tower???

Otherwise, you could attach a fullwave Delta Loop with the top/peak hanging
off the tower top and the bottom of the triangle supposed by ground stakes
and rope..did that with a full size 1wl loop off a 250ft microwave tiower
20yrs ago...worked like a charm on 160 and upward..highest SWR was 3:1 on
second harmonic (80m)...

Chris
WB5ITT
Society of Broadcast Engineers member
Former CE of the famous 1190, former KLIF, Dallas (with its 12 tower
broadside nighttime array)

> -----Original Message-----
> From: antennas-bounces at mailman.qth.net [mailto:antennas-
> bounces at mailman.qth.net] On Behalf Of Joe
> Sent: Tuesday, November 09, 2010 6:54 PM
> To: antennas
> Subject: [Antennas] 160 Antenna
> 
> I'm looking for suggestions on how to use a say large tower for 160
meters.
> 
> This is NOT an insulated broadcast tower,  but a tower that has like
> cell phone and police and the like on it.
> 
> So obviously there is no ground plane.
> 
> What configuration of feeding a tower like this would be good for 160
> meter operation?
> 
> Joe WB9SBD
>