A horizontal rhombic antenna (picture below) radiates horizontally polarised waves.

By August, a barn complex behind the manor house had been converted into a permanent intercept station and powerful rhombic antennas were installed.

Each relay station consisted essentially of back-to-back rhombic antennas on opposite sides of a hilltop, connected via an amplifier.

In 1960 two rhombic antennae were installed for use with NASA space missions, bringing the total number of antennae up to 22.

The VLF antenna consists of four rhombic antennas hung on large insulators on the masts, which are all grounded.

However, rhombic antennas are used in cases where the combination of high forward gain (despite the losses described above) and large operating bandwidth cannot be achieved by other means.

Rhombic antennas were installed on the Parade Ground, and the old post exchange/gymnasium building was converted into a top secret listening post code-named "Station S".

For example, BBC Monitoring's Crowsley Park receiving station has three rhombic antennas aligned for reception at azimuths of 37, 57 and 77 degrees.

Multiple rhombic antennas can be connected in an end-to-end fashion to form MUSA (Multiple Unit Steerable Antenna).

A rhombic antenna is a broadband directional antenna co-invented by Edmond Bruce and Harald Friis, mostly commonly used in HF (high frequency, also called shortwave) ranges.

During the early 1930s Friis helped design the radio receiver used by Karl Jansky for radio astronomy, and with Edmond Bruce invented the rhombic antenna widely used for shortwave communications.

The rhombic antenna, like other horizontal antennas, can radiate at elevation angles close to the horizon or at higher angles depending on its height above ground relative to the operating frequency and its physical construction.

The most common antennas in this band are wire antennas such as the rhombic antenna, in the upper frequencies, multielement dipole antennas such as the Yagi, quad, and reflective array antennas.

Bruce received the 1932 IEEE Morris N. Liebmann Memorial Award "for his theoretical investigations and field developments in the domain of directional antennas", and the Franklin Institute's 1935 Longstreth Award for inventing the rhombic antenna.

In 1924 he joined the Western Electric Company, and in 1925 became a research engineer at Bell Telephone Laboratories, where he helped develop short-wave radio receivers and field strength measuring equipment, and designed directional antennas for short-wave radio communication, including his celebrated rhombic antenna (1931).