G5RV 40m Beam Antenna



Adding a 28 ft. piece of vertical wire to one end of a 102 ft. center-fed dipole turns it into a 40m beam with a very wide beamwidth. From my QTH in Texas, I can cover virtually all of the USA.


The feedpoint impedance changes when the vertical wire is added. To achieve a better match, W5DXP reduces the length of the 300 ohm matching section to 17 feet when configured as above. Also, since the antenna is unbalanced by the single vertical wire, a good choke is necessary at the twinlead/coax junction. As a bonus, 17 ft. is also a good length for the matching section when the standard G5RV is used on 30m.