This is a ground plane antenna for 20 meters. Radiating element is 217.5 inches long. Bottom of the transmitting element is 60 inches off the ground. There are 8 ground radials each 145.7 inches long are all tied together 54 inches above the ground. The radiator is 1 inch aluminum pipe using 12 ga wire as the ground plane.

Here are the Far field plots for this antenna 

Great for DX

SWR plot for 800 kHz bandwidth 14.0 - 14.4 MHz 

SWR is less than 1.2 for the entire 20 Meter band

Current Field for 20 Meter Vertical Antenna

20 Meter Vertical Z plot form 14.0 through 14.4 MHz 

Antenna is matched for 50 ohm feed line.