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Technical resource and information on receiving and transmitting antennas, receiving amplifiers, radios, baluns, for 160 meters 80 meters and other low bands.
The 100 - 105 feet long doublet length reduces large impedance excursions present in half wave 80 meter doublets when used on harmonics. For example, a half wave center fed doublet or dipole appears as 40-100 ohms on the band where it is 1/2 wave long.
The all band doublet antenna is nothing more than a 1/2 wave dipole cut for your lowest operating frequency and fed with twinlead, ladder line, open wire, etc to a tuner that will accept a balanced line connection.
Here are antenna models of the Ham Universe all band curtain: 28.5 MHz gain is 12.55 dBi, or +4 dBd. It is a good antenna for ten meters! 24.9 MHz gain is 12.43 dBi, or 4 dBd. It is still a good antenna for 12 meters, a little better than an extended double Zepp. 21.1 MHz gain is 6.13 dBi, or -2 dBd. This is weaker than a dipole by 2 db.
W8JI map: Each arrow indicates an antenna, with the arrow heads indicating directions. When multiple arrows are parallel, the antenna is an array of all antennas. For example, if you look southeast of the 8 circle vertical (160M), you will see three arrows going NE and SW. This array is three 880-ft Beverages
3 kwi 2020 · Although the popular G5RV antenna is often promoted as an antenna that works well on all bands from 80 through 10 meters, that is absolutely NOT the case. This is not to say that the G5RV doesn’t work well on SOME bands.
W8JI’s Receiving Antennas. Conventional Beverage’s ~580 feet long in seven directions. Specifications @ 15 degree wave angle: Every 45 degrees from NE to NW. Directivity factor 7.29 dB, Half-power. Beamwidth 78 degrees. Arrays of Broadside Beverages 780 x 350 feet: Specifications @ 15 degree wave angle:
