Sirio SDB 702 Mag-60-S Dual Band VHF/UHF Mobile Antenna 2m & 70cm Ham, 100W, No Tuning

The Sirio SDB 702 is a compact, dual-band VHF/UHF mobile antenna engineered in Italy for 2-metre and 70cm amateur radio use. Covering VHF 141–149 MHz and UHF 430–440 MHz with no tuning required on either band, it delivers 0 dB VHF gain and 2 dB UHF gain (referenced to a λ/4 whip) with 100W CW power handling. Compatible with 2m HAM, 70cm HAM, ORBCOMM M2M, TETRA, CDMA-450, and ISM/SIGFOX/LoRa 433MHz, it's a versatile and discreet mobile antenna for a wide range of applications.

Key Features

• 100W CW power handling
• VHF: 141–149 MHz — no tuning required
• UHF: 430–440 MHz — no tuning required
• Gain: 0 dB VHF / 2 dB UHF (ref. λ/4 whip)
• Compatible systems: 2m HAM, 70cm HAM, ORBCOMM M2M, TETRA, CDMA-450, ISM/SIGFOX/LoRa 433MHz
• Omnidirectional radiation pattern
• Linear vertical polarisation
• VHF: 1/2λ design | UHF: 5/8λ design
• Supplied with 3m RG58 cable
• Magnetic base 65mm
• Height: 470mm / 1.54ft
• Weight: 360g / 0.79lb
• Connector: PL259
• Premium materials: chromed brass, stainless steel 17/7 PH & nylon
• Made in Italy by Sirio

Technical Specifications

• Type: VHF 1/2λ / UHF 5/8λ dual-band mobile antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• VHF frequency range: 141–149 MHz (no tuning required)
• UHF frequency range: 430–440 MHz (no tuning required)
• Systems: 2m HAM, 70cm HAM, ORBCOMM M2M, TETRA, CDMA-450, ISM/SIGFOX/LoRa 433MHz
• Gain: 0 dB VHF / 2 dB UHF (ref. λ/4 whip)
• Max power: 100W CW
• Cable: 3m RG58
• Connector: PL259
• Height: 470mm / 1.54ft
• Weight: 360g / 0.79lb
• Mounting: Thru-hole
• Materials: Chromed brass, stainless steel 17/7 PH, nylon
• Country of origin: Italy

Frequently Asked Questions

Does the SDB 702 require tuning?
No. It is pre-tuned for both VHF (141–149 MHz) and UHF (430–440 MHz) and is ready to use straight out of the box with no adjustment needed on either band.

How is it mounted on the vehicle?
The SDB 702 Mag-60-S variant uses a 65mm magnetic base, allowing tool-free placement on any flat metal surface such as a car roof or boot lid. No drilling is required.

What connector and cable does it come with?
It is supplied with a 3m RG58 coaxial cable terminated with a PL259 (UHF Male) plug, compatible with SO-239 sockets on most VHF/UHF transceivers.

What is the maximum power it can handle?
100W CW, suitable for most mobile VHF/UHF transceivers used in amateur radio.

Is it compatible with TETRA, ORBCOMM, or IoT systems?
Yes. In addition to 2m and 70cm amateur radio, the SDB 702 is listed as compatible with TETRA, ORBCOMM M2M, CDMA-450, and ISM/SIGFOX/LoRa 433MHz systems, provided the operating frequencies fall within its tuned ranges.

What is the gain on each band?
0 dB on VHF (referenced to a λ/4 whip) and 2 dB on UHF (referenced to a λ/4 whip). The UHF 5/8λ design provides a modest gain advantage over a standard quarter-wave on 70cm.

How long is the antenna and cable?
The antenna element is 470mm (approximately 18.5 inches) tall. The supplied RG58 cable is 3m long, giving enough reach for most vehicle dashboard or boot installations.

Is the magnetic base strong enough for motorway speeds?
The 65mm magnetic base is designed for secure vehicle mounting. However, for sustained high-speed motorway use, a permanent thru-hole or NMO mount is generally recommended for maximum security.