[TowerTalk] CobWebb antennas - success stories?

[Jim Lux]

At 05:58 PM 9/22/2004 -0400, jsb at digistar.com wrote:

>Anyone have any success stories regarding the CobWebb antenna?
>
>http://www.g3tpw.ukgateway.net/
>
>
>I'd like to get one but it's about $500 to get one here after the exchange
>rate and shipping.  Just wondering if anyone had tried one of these before
>and had any opinions to share...  or if there's a better list to move the
>thread to i'd be happy to take it there.
>
>
>73 Jason N1SU


An interesting take on a compact loop antenna, or, perhaps, more properly, 
a shortened, endloaded dipole.  It's a clever design, and would be simple 
to model in NEC, but isn't going to be easy to analyze in other ways.

Since it's physically larger than a classic 1m compact loop, the radiation 
resistance will be higher, so the current will be lower, probably reducing 
loss (compared to a compact loop).   One couldn't analyze it as a loop, 
because the classical compact loop analysis assumes that the current is the 
same everywhere in the loop, which is only true for a very small loop.

It will probably be more omnidirectional than a dipole, so the gain, 
compared to a dipole, would be lower.

As far as ground interaction and so forth goes, I doubt it's much different 
than a dipole at the same height.

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