[Elecraft] cobweb antenna

[Vic K2VCO]

Theoretically, performance should be similar to a dipole, although with a 
near-omnidirectional pattern (and of course reduced bandwidth). It might be perfect for 
certain antenna-restricted circumstances.

There is a statement on the G3PTW website which is interesting, and I would like to hear 
what others say about this:

"The confined electric near field (caused by the high impedance ends of each dipole being 
close to each other) also ensures that the antenna does not couple to other electrical 
conductors i.e. telephone wires, power cables, television antennas or even the ground and 
lossy di-electrics such as trees and buildings. Thus the radiated power is not absorbed by 
nearby objects, it is all radiated into free space. Breakthrough and noise pick up are 
also reduced to an absolute minimum and the ground conductivity and height do not affect 
the antenna tuning."

Does this sound reasonable?

On 5/31/2013 10:46 AM, Yngvi (TF3Y) wrote:
> Hi folks.
 >
 > I used a CobWebb by G3TPW for a few years. It's a nice and compact
 > antenna and it withstood the Iceland climate very well. I had it on a
 > 16 ft. 2.5" dia aluminium tube at the top of my house. Total height
 > above ground 32 ft.
 >
 > The performance was always better than a full size 1/4 wave ground
 > mounted vertical and noise floor on RX considerably lower.
 >
 > The CobWebb has a fairly narrow bandwith as it is a dipole bent in a
 > square. The dipole is T matched with a current balun at the
 > feedpoint. It's almost omni directional.
 >
 > I currently have a 2 el. SteppIR but I really liked the CobWebb. It's
 > quite an efficient antenna.
 >
 > 73, Yngvi TF3Y http://www.tf3y.net


-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/