[TowerTalk] Mosley (Antenna Gain)

[Chuck Smallhouse]

"Since the 70s,  at least a dozen times we have helped swap a Mosely 
TA-33 jr to
something else, usually a Hy-gain 204BA.   The difference on 20m is the
usual 10 db".

You really must have drunk a lot of the CC Kool Aid.  There is no HF 
yagi antenna that has anywhere close to 10 dBD gain, let alone that 
difference over another !  Even a stacked monobander system doesn't 
come close to 10 dBD gain .

In my opinion, no multiband yagi has anywhere close to optimum gain, 
they are all compromises.   To meet the current needs of SS xmtrs and 
PAs (no manually tune pi networks) they are designed to be broad band 
and thus compromise gain.    The more elements (more bands) the 
greater the compromise.

The tunable SteppIR that supposedly can be optimized at all 
frequencies across a band, might be better, even though the element 
spacing remains the same for all bands and frequencies.  However 
monoband yagis, with good gain, can be designed with element spacing 
of < 0.1 WL to > 0.3 WL.  I assume that SteppIR's S/W takes this into 
account, therefor essentially making them a muti-band set of monoband yagis.

No I don't have one - just a fairly new design, broadband tribander.

Chuck,  W7CS