The Sloper Antenna is a slanted

Dipole antenna In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole w ...

Advantages

While horizontal dipoles required two large support masts, this antenna type only needs one large mast. It is therefore widely used by

radio amateurs An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way communication, two-way personal communications with other amateur operators on Frequency, radio frequencies Amateur radio frequency allocatio ...

with limited space.Practical Wire Antennas (J. Heys, G3BDQ) In particular for

low frequencies Low frequency (LF) is the ITU designation for radio frequencies (RF) in the range of 30–300 kHz. Since its wavelengths range from 10–1 km, respectively, it is also known as the kilometre band or kilometre wave. LF radio waves ex ...

this antenna form is interesting. The angle of the slope is usually between 45°–60° and the lower end of the wire is at least wavelength above the electrical

ground Ground may refer to: Geology * Land, the surface of the Earth not covered by water * Soil, a mixture of clay, sand and organic matter present on the surface of the Earth Electricity * Ground (electricity), the reference point in an electrical c ...

. A sloper is typically fed with a

coaxial cable Coaxial cable, or coax (pronounced ) is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric ( insulating material); many coaxial cables also have a p ...

in the center, at the top of the center support mast. At least of the wavelength of

feedline In a radio antenna, the feed line (feedline), or feeder, is the cable or other transmission line that connects the antenna with the radio transmitter or receiver. In a transmitting antenna, it feeds the radio frequency (RF) current from the ...

must be at 90° angle to the antenna. It is also possible to feed the antenna asymmetrically.Reinprecht, K. OE5RI. Asymmetrisch gespeiste Sloper-Antennen
/ref> Due to the low-angle radiation pattern this antenna has, it performs well for long distance contacts (QSOs) (DX).

References

Radio frequency antenna types Antennas (radio) {{Antenna types , state=expanded