Longwire Antenna
The longwire is a straight wire several wavelengths long, fed at one end. Unlike a random end-fed wire, a true longwire develops directivity along the wire direction.
Try this antenna
Use it to explore long-wire directionality rather than as a shortcut to a matched antenna. Set a length appropriate to the wavelength, point the wire toward the target region, and inspect SWR and actual reception.
Compare antenna types and tuning steps · Calculate a starting length · Understand the coverage
Configuration
A single horizontal wire running along the azimuth, default length 21 m; a length of 0 selects two wavelengths at the operating frequency.
Characteristics
- Typical gain around 4 dBi with lobes that press toward the wire direction as the wire gets electrically longer.
- Typical takeoff angle around 20 degrees.
- Multi-band by nature: it presents workable (though rarely excellent) matches on many frequencies, with SWR varying between harmonics. Expect a rougher match than a resonant dipole; a tuner-style loss is reflected in the higher default feedline loss (1.2 dB).
- Directional along the wire run: point the azimuth roughly toward the target.
When to use
When simulating a simple field or shortwave-listener style station with one long wire, or when multi-band capability matters more than a clean match. For a serious single band, a resonant Dipole Antenna usually wins.