Alpha Delta DX-SWL Shortwave Sloper Antenna (40M)


Alpha Delta SWL Sloper Antennas are a very unique and very effective adaptation of existing antenna theory. They operate as quarter-wave slopers, which means that the wires are one-quarter wavelength long; or multiples of a quarter-wave on each frequency band.


These SWL Sloper Antennas are designed to cover: Medium Wave (0.5 to 1.6 MHz) and the 120, 90, 60, 49, 41, 31, 25, 21, 19, 16 and 13-meter SWL shortwave bands. Compared to a standard half-wave dipole, the other quarter wave of these antennas, which is necessary for the performance and the proper feed point impedance, is made up of the “Down-Lead” wire, which is attached.

With a quarter-wave sloper, the centre conductor of the coax is attached to the radiating wires and the shield of the coax is attached to the down lead. Standard SO-239 (UHF female) connectors are provided on the ALP-DX-SWL for this purpose.

Excellent performance is attained with installations of only 20 to 40 ft. in height. Historically, and by design, quarter-wave sloper antennas are known to be excellent DX and long haul antennas. The current lobes, which define the major radiation characteristics of an antenna, are up high at the feed point and are not as subject to attenuation as a vertical antenna, whose current lobe is at ground level.

Wire Antenna BandWire Antenna Frequency
90 meters2.3 – 2.5 MHz
60 meters3.2 – 3.5 MHz
49 meters4.75 – 5.0 MHz
41 meters5.95 – 6.2 MHz
31 meters7.1 – 7.3 MHz
25 meters9.5 – 9.9 MHz
21 meters11.65 – 12.05 MHz
19 meters13.6 – 13.8 MHz
16 meters15.1 – 15.6 MHz
13 meters

17.55 – 17.9 MHz

Additional information

Weight 2 kg