M2 2M9SSB/FM Assembly Manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722 

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com 

©2015 M2 Antenna Systems Incorporated 

06/25/15 

Rev.03 

Model  ......................................... 2M9SSB/FM 

Frequency Range (2M9SSB) ..... 144 To 146 MHz 

Frequency Range (2M9FM) ....... 145 To 148 MHz 

*Gain .......................................... 14.1 dBi 

Front to back .............................. 20 dB Typical 

Beamwidth   ............................... E=35° H=38° 

Feed type ................................... “T” Match 

Feed Impedance. ....................... 50 Ohms Unbalanced

Maximum VSWR ........................ 1.2:1 Typical 

Input Connector .......................... “N” Female 

Power Handling .......................... 2.5 kW 

Boom Length / Dia ...................... 14’ 6” / 1” To 3/4” 

Maximum Element Length .......... 40-5/8” 

Turning Radius: .......................... 8’ 

Stacking Distance ....................... 9’ 6” High & 10’ Wide 

Mast Size .................................... 1-1/2” to 2” Nom. 

Wind area / Survival ................... 1.2 Sq. Ft. / 100MPH 

Weight / Ship Wt. ........................ 5 Lbs. / 7 Lbs. 

M2 Antenna Systems, Inc. 

Model No: 2M9SSB/FM 

FEATURES: 

Up to the minute design using a state-of-the-art computer optimization program to deliver the most gain for boom length of any antenna on the 

market.  Each model’s performance is optimized for a specific mode and frequency range,  with no compromises to achieve unneeded band-

width: the 2M9SSB covers 144-146 MHz and the 2M9FM  covers 145-148 MHz.  Where do you want to make yourself heard? 

Both models are ideal building blocks for a small turning radius, high-gain stacked array. Two  horizontally polarized,  vertically stacked 

2M9SSB’s yield the same gain (14.8 dBd) as M

2

’s 33 ft 2M5WL, but with about 1/2 the turning radius (8’ - great for QTH’s that won’t permit a long boom 

Yagi).  The 2M9FM can be stacked on a cross boom for the same gain increases, and the turning radius is still a very manageable 10 ft.  

The heart of these antennas is a driven element module originally designed for maritime ATS satellite service. All connectors are O-ring 

sealed to the CNC machined block. Internal connections are sealed with a space-age silicone gel with nearly 4 times the dielectric strength of air. The 

balun connectors are triple sealed on the coax and nut-sealed at the block connectors. The type “N” feed connector uses a gold-plated, beryllium copper 

center pin.  

       Elements are 6061-T6 3/16” solid rod with UV stabilized polyethylene Button insulators and stainless steel keepers. Thousands of these type ele-

ments are in amateur and commercial service with NO failures! Booms are constructed of 6063-T832 aluminum alloy tubing with close-tolerance 

swaged joints. Other key electrical and mechanical components are CNC machined for accuracy and durability. All hardware is stainless steel except 

the U-bolts.  For uncompromising performance and long term electrical  / mechanical integrity, the 2M9SSB and 2M9FM are unmatched. 

SPECIFICATIONS: 

*Subtract 2.14 from dBi for dBd