[ARC5] Antenna for small yard

[Kenneth G. Gordon]

On 22 Oct 2016 at 11:38, David Stinson wrote:

> > ... Why make things complicated by going to 50 ohms, then > matching
> > that? 
>
> Because you need a feedline to get the RF outside without half your
> electrically-short antenna inside a building, with circulating current
> losses to the many grounded structures all around on its way out. 

Exactly.

The 50 ohms (or whatever "ohm" feedline you want to use) is a means to the end you seek. 
Nothing more.

You mentioned 300 ohm twin lead once: even that would work with the proper Un-Un, but 
300 ohm twin lead is, to my mind, harder to hide than coax, and a lot more difficult to come 
up with unless you already have some.

Whatever feed-line you use is simply to enable you to get your RF from the TX to the 
antenna, and back to the receiver.

Your TX isn't going to "care" what is between it and the antenna as long as you match 
impedances.

Personally, if I were in your shoes, I would mount the 33' antenna on the fence (24 feet 
horizontally, 4.5 feet on each end dropping straight down), using #36 black enameled wire, 
some black RG-58 lying or buried as hidden between the concrete slabs as possible, to 
reach the antenna, then either an Un-Un at the TX/RX end or a cap in series with the center 
conductor of the feed-line. To me the Un-Un is so easy to make and so much less hassle, 
I'd use that.

Ken W7EKB

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