GLENAYRE Wireless Line Extender 380-512 MHz (Directional Antenna)

Circa 1996

A Yagi-style antenna, which is a type of directional antenna used for transmitting and receiving radio frequency signals.

Use Case:

Designed for professional or commercial two-way radio communication systems, in land mobile radio (LMR) or paging networks, within the 380 to 512 MHz frequency range. This range covers the UHF (Ultra High Frequency) spectrum, commonly used for public safety (police, fire, EMS) and business radio services.

The antenna's directional nature means it is used to focus the radio signal in a specific direction, increasing range and signal strength for point-to-point communication or to cover a particular geographic sector. It would be mounted outdoors or high up on a mast (as shown by the mounting bracket) to maximize coverage.

Law Enforcement Applications:

• Tracking moving transponders: Yagi antennas are commonly used in conjunction with a receiver for radio direction finding (RDF), which is the primary method for tracking moving radio tags on animals and vehicles. By rotating the antenna and observing the signal strength, an operator can determine the direction of the transmitter. Taking multiple bearings from different locations allows for triangulation to pinpoint the exact location of the moving object.

• Identifying illegal transmitters: Law enforcement agencies and spectrum management authorities (like the FCC) use directional antennas and spectrum analyzers to detect, localize, and identify the sources of unauthorized radio emissions. The antenna's high gain and focused beam help in isolating a signal from a specific direction, cutting through interference.

• Surveillance of transmissions: The same directional properties and frequency range (380-512 MHz) can be utilized by law enforcement agencies, given proper legal authority, to monitor radio communications or data transmissions. Specialized monitoring equipment can be used to not only find the signal's direction but also analyze and potentially record the signal content. This process involves sophisticated techniques like spectrum analysis and signal strength localization.

NOTE: 2-Units available. Can be rigged with a pistol grip for handheld use.

(H-74cm x W-40cm x D-9cm)