Combination GPS/VHF 3 dB Gain Mobile Antenna, 146–172 MHz

The Motorola RAD4218B is a combination GPS and VHF mobile antenna designed to provide two-way radio communication and satellite-positioning reception through one streamlined vehicle installation.

Its wide 146–172 MHz VHF range and 3 dB gain design help extend mobile communication coverage, making it well suited for fleets operating across a broad portion of the VHF band.

With permanent through-hole mounting and a Mini-UHF radio connector, this genuine Motorola antenna provides a professional solution for compatible GPS-enabled mobile radios.

Key Features

• Combination VHF and GPS antenna

• VHF frequency range of 146–172 MHz

• 3 dB VHF gain

• Integrated GPS reception

• Permanent through-hole installation

• Mini-UHF radio-frequency connector

• Supports voice, data and GPS tracking applications

• Reduces the need for separate VHF and GPS antennas

• Designed for fleet and public-safety vehicles

• Genuine Motorola accessory

• Motorola part number RAD4218B

Combined Voice, Data and GPS Coverage

The RAD4218B combines a wideband VHF antenna and GPS antenna into one vehicle-mounted assembly. It supports two-way voice and data communication while also providing satellite reception for compatible radio location and tracking features.

This combined design creates a cleaner installation than using separate VHF and GPS antennas on the same vehicle.

3 dB Gain for Expanded Coverage

The antenna’s 3 dB gain design focuses more radio-frequency energy toward the horizon than a unity-gain 1/4-wave antenna. This can help improve communication range across open terrain, highways and other relatively flat environments.

Higher-gain antennas may be less effective than unity-gain antennas in steep or mountainous terrain. Actual performance depends on terrain, vehicle placement, system configuration and surrounding structures.

Wide 146–172 MHz VHF Range

The RAD4218B covers most of the standard VHF mobile radio band, reducing the need to select among several narrow-band antenna models. This broad frequency coverage makes it useful for fleets operating on multiple VHF channels between 146 and 172 MHz.

The connected radio must be programmed and authorized to operate on the required frequencies.

Permanent Through-Hole Installation

This antenna is designed for permanent installation through a suitable metal vehicle roof or trunk surface. Mounting near the center of a metal roof generally provides the strongest available ground plane and the most balanced performance.

Professional installation is recommended to ensure correct mounting, weather sealing, cable routing and connector installation.

Radio Compatibility

The RAD4218B is compatible with select GPS-capable Motorola VHF mobile radios that use the appropriate Mini-UHF antenna connection.

Compatibility depends on the radio’s exact frequency split, GPS capability and antenna connector. Confirm all three requirements before ordering.

Important GPS Requirement

The connected radio must support GPS functionality for the integrated GPS portion of the antenna to operate. GPS features may also require radio programming, compatible dispatch software or an active location-services configuration.

Why Choose the Motorola RAD4218B?

The RAD4218B combines wide VHF frequency coverage, 3 dB gain and GPS reception in one professional antenna system. It is an excellent choice for organizations that want dependable voice communication and vehicle location reporting without installing separate VHF and GPS antennas.

For assistance confirming radio compatibility or selecting the correct mobile antenna, contact Delmarva Communications before ordering.