How is grounding handled for connected radio devices?

The antenna is electrically grounded and all metal parts are D.C. grounded to help protect connected radio devices and reduce electrostatic charge build-up.

ARM2FM Mobile Omnidirectional FM Measurement Antenna 87.5–108 MHz | Magnetic Base | Protel - Protel Antennas - Professional Antennas for Telecomunications

Q: What is the ARM2FM used for?

ARM2FM is a mobile omnidirectional measurement antenna with magnetic base for the FM broadcast band 87.5-108 MHz, designed for radiomonitoring, on-the-move surveys, coverage checks and interference diagnostics.

Q: Which services fall inside 87.5-108 MHz?

87.5-108 MHz corresponds to FM broadcasting (Band II). Typical monitoring tasks include transmitter checks, field-strength/coverage surveys, RDS verification and troubleshooting of unwanted signals within the FM band.

Q: Why choose a magnetic-base omnidirectional antenna for mobile FM surveys?

The magnetic base enables fast fixing on vehicles, while the omnidirectional pattern (360° azimuth) supports continuous reception during drive tests, coverage mapping and routine monitoring when signals can arrive from multiple directions.

Q: What are key mechanical limits for mobile use?

Quick fixing is achieved via three strong magnets positioned 120° below the reference disc, and the antenna is specified for a maximum movement speed of 110 km/h.

Q: What documentation is included?

A complete manual can include internal calibration with typical gain factor, datasheet, certificate of conformity (with serial number), H/V radiation patterns, return loss test report, K-factor calculation and assembly instructions.

ARM2FM Radiomonitoring FM Omnidirectional measuring magnetic antenna 87.5 - 108 MHZ

Measurements Antennas

MAGNETIC MONITOR ANTENNA FOR MOBILE USERS, FREQUENCY BAND 87.5 - 108 MHz

MOD. ARM2FM

mobile measurement Band FM with magnetic anchorage

Complete manual including:

• Internal calibration with typical gain factor
• Datasheet with general product characteristics
• Certificate of Conformity including the product serial number
• H/V radiation patterns
• Return loss test report
• K-factor calculation
• Assembly instructions

ELECTRICAL DATA
Frequency range MHz 87.5 ÷ 108
Gain max. dBi 2.2
Return loss max. dB ≥ -12
VSWR max. ≤ 1.67:1
Nominal impedance Ω 50
Polarization Ω V
H beamwidth typ. -3 dB 360°
E beamwidth typ. -3 dB 80°
Max Power W 500
Connector N f.
Operating temp. °C -20÷70°
Lightning protection All metal parts are D.C. grounded
MECHANICAL DATA
Dimension length mm 880 x Ø 310 x Ø 100
Weight kg 4.5
Max. speed of movement Km/h 110
Mounting mm n. 3 magnets 120 ° Ø122
MATERIALS
Aluminium –Teflon –Polyvinyl chloride -RoHS compliance –
ORDERING AND PACKAGING INFORMATIONS
packaging 400x400x1000
ACCESSORIES
BAG-01 400X900X1300 Polyvinyl chloride suitcase 3 Kg

Antenna for mobile measurement with magnetic anchorage, designed for the FM broadcast band (87.5–108 MHz). This band (VHF Band II) carries FM radio services, so typical use cases include on-the-move radiomonitoring, coverage/field-strength surveys, transmitter checks, and interference diagnostics within the FM spectrum (including practical verification tasks such as RDS monitoring).

The ARM2FM is engineered for mobile workflows: the full UPVC protective cover (radome) improves resistance to harsh atmospheric agents, and the design includes an independent ground plane with the antenna electrically grounded to help protect connected radio devices. Quick fixing is achieved via three strong magnets positioned 120° below the reference disc, supporting fast deployment on vehicles during measurement sessions.

Radiomonitoring
Monitoring and measurement of RF signals

Antenna designed and manufactured in Italy.

Frequently asked questions about ARM2FM

Quick answers for FM Band II (87.5–108 MHz) mobile radiomonitoring, drive tests and professional field-strength surveys.

What is the ARM2FM used for?

ARM2FM is a mobile omnidirectional measurement antenna with magnetic base for FM band surveys, coverage checks, radiomonitoring and interference diagnostics across 87.5–108 MHz.

Which services fall inside 87.5–108 MHz?

This range corresponds to FM broadcasting (Band II). Typical tasks include transmitter monitoring, field-strength surveys, coverage mapping, RDS verification and troubleshooting unwanted signals inside the FM band.

Why choose a magnetic-base omnidirectional antenna for mobile surveys?

The omnidirectional pattern (360° azimuth) supports continuous reception during drive tests, while the magnetic base enables fast installation on vehicles for rapid measurement sessions.

How is grounding handled to protect connected radio devices?

The antenna is electrically grounded and all metal parts are D.C. grounded, helping reduce electrostatic charge build-up and supporting safer operation for connected equipment.

What are key mechanical limits for mobile use?

Quick fixing is obtained via three magnets positioned 120° under the reference disc, and the antenna is specified for max movement speed 110 km/h.

What documentation is included for professional reporting?

A complete manual can include: internal calibration with typical gain factor, datasheet, certificate of conformity (with serial number), H/V radiation patterns, return loss test report, K-factor calculation and assembly instructions.

ARM2FM Radiomonitoring FM Omnidirectional measuring magnetic antenna 87.5 - 108 MHZ - Protel Antennas - Professional Antennas for Telecomunications

ARM2FM Radiomonitoring FM Omnidirectional measuring magnetic antenna 87.5 - 108 MHZ

Frequently asked questions about ARM2FM

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