For: DX portion 11 meter band
Antenna Type: 3el Cubical Quad
Designed by: HPSD version 1.01 jan 2008
(updated with NEC5 2025)
Boom length: 4,2 Meter
Gain: 9,43 dBI (@27,555 Mhz)
FB <30 dB
FR <20 dB
Impedance: 50 ohms, direct fed
SWR below 1:1.1 > 100 Khz.
SWR below 2:1 > 600 Khz
Above the freespace azimuth plot
Above the freespace elevation plot
Very tight for a 3el !
Above the SWR diagram.
Above the gain, front to back and front to rear response versus frequency.
The elevation plot when placed 11 meters above average ground conditions
The elevation plot when placed 18 meters above average ground conditions.
Element Diameter
The wires consist of 3mm thick diameter “bare” copper wire. WITHOUT THE ISOLATION.
DO NOT USE OTHER DIAMETERS
Element distances:
Reflector to radiator = 2,1 Meter
Reflector to director 1 = 4,2 Meter
Element length:
(per side so total length x 4)
Reflector = 2,880 Meter
Radiator = 2,790 Meter
Director = 2,693 Meter
FEEDING THE ANTENNA:
The antenna has a 50 ohm impedance. It can be direct fed. (1-1 balun is preffered).