This antenna is removed and replaced with a 6 el yagi with 12m boom placed in the second tower.
The 4 element 12 m yagi is made of a CueDee 4 el 15m Yagi. The elements are of course shortened but the boom is extended to 7m (23 ft). As the 12 m band is very narrow the antenna can be optimized for Gain and F/B. Mike SJ2W has made the final design.
|Boom legth (diam 50 mm/ 2″)||7 m (23 ft)|
|Longest Element||6.22 m (20,33 ft)|
|Forward Gain (free space)||7.23 dBd|
Antenna tested at 7m over ground.
The gamma match is orginal CueDee just refurbished with new stainless steel screews.
MMANA plots for antenna at 12m (39 ft) without the gamma match.
HFTA plots, could be higher for oceania but the other paths looks resonable.
Final feeder 0.5 wave lenght of RG-213, Phase shift 179.97 degrees. Loss 0.03 dB