I once heard LB Cebik give a 'balloon' analogy of directional or gain
antennas.
He said the radiation pattern is like a balloon - you have to squeeze it
somewhere to get it to expand in another direction. There is no overall
gain, it just directs the radiation in one or more directions at the
expense of other directions.
73,
Don W3FPR
On 1/13/2018 11:41 AM, K9MA wrote:
One extreme case is the center-fed full wave, or "two half waves in
phase". It has the high feedpoint impedance of the EFHW (actually about
double) and has a pattern much like a dipole, but sharper. It has a
couple dB of gain over a dipole broadside but, of course, less gain in
other directions.
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