3 Element Yagi Optimized for Maximum Gain
Free Space
24.94 MHz
3 wires, inches
10      -93,-115.479,0     -93,115.479,0      1
10        0,-111.189,0       0,111.189,0      1
10       97,-110.851,0      97,110.851,0      1
1 source
14,224,0
0 loads

While this antenna provides the most gain I could squeeze out of 3 elements on
any length boom, it has a very narrow impedance bandwidth and is only suitable
for the 12 meter band.  Even there it has an SWR of 1.5 at the band edges when
matched at the center of the band.  The rear lobe is also quite high.  However,
the front lobe is remarkably narrow for only 3 elements (this must be where it
extracts its gain).