[TowerTalk] SteppIR 4 Element Yagi - Analysis and Thoughts

[Joe Subich, K4IK]

> Has any one tried modelling this product or know of any addtional
> information/discussion about it? I don't see any mention of it at
> http://www.steppir.com but the ad appears only to be the first product
> announcement.

The MonstIR is an amateur version of a receive only antenna that 
is sold to agency buyers (the commercial version includes coverage 
to 3 MHz with switched coils).  Based on the specs and pictures, 
the elements are in the same position as the current 4 element 20-6
meter antenna.  

Doing some quick modeling with YO, the MonstIR will be capable 
of about 7.0 dBi free space gain/20 dB F/R on 40 meters and 
about 7.3 dBi gain/18b dB F/R on 30 meters.  The gains and F/R 
are better than any of the short/loaded 40 meter antennas but 
are not quite as good as a "full size" (ca. 46-48' boom) three 
element 40 or 30 meter yagi.   

Still, for a single antenna with coverage from 7 to 30 and 50-54
MHz, it merits serious consideration. 

73, 

   ... Joe, K4IK