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

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

©2018 M2 Antenna Systems Incoporated

 

5/23/18 

REV A 

Model  ......................................... 420-50-11 
Frequency Range ....................... 420 To 450 MHz 

*

Gain .......................................... 13.44 dBi 

Front to back .............................. 20 dB Typical 
Beamwidth   ............................... E=34° H=43° 
Feed type ................................... Folded Dipole 
Feed Impedance. ....................... 50 Ohms Unbalanced

 

Maximum VSWR ........................ 1.2:1 Typical 
Input Connector .......................... “N” Female 

Power Handling .......................... 1 kW 
Boom Length / Dia ...................... 60” / 1” 
Maximum Element Length .......... 13-3/4” 
Turning Radius: .......................... 55” 
Stacking Distance ....................... 34” High & 36” Wide 
Mast Size .................................... 2” Nom. 
Wind area / Survival ................... 0.6 Sq. Ft. / 100 MPH 
Weight / Ship Wt. ........................ 4 Lbs. / 6 Lbs.

 

M2 Antenna Systems, Inc. 

Model No: 420-50-11 

SPECIFICATIONS: 

*Subtract 2.14 from dBi for dBd 

FEATURES: 

 

The 420-50-11 has been computer designed to cover the entire amateur 70 CM band. It is ideal for repeater link-

ing or any point to point application. Comparing it to a common reference, the KLM 420-450-11, it has the same usable 
bandwidth with a full one dB more gain and the pattern is much cleaner. Clean patterns in most applications provide more 
reliable communications with less intermod. An optional stacking harness is available when more than one antenna is 
required for reduced beamwidth or additional gain. Because the antenna covers the whole band, many users find it a nat-
ural for ATV and general repeater use. Users are surprised by the performance of this compact but potent antenna. 
 

Construction is classic M

2

 for long term electrical and mechanical integrity. Elements are 3/16” 6061-T6 rod, 

mounted through the boom on UV stabilized insulators and locked in place with stainless steel shaft retainers. The driven 
element module is CNC machined and all connectors O-ring sealed. Internal connections are encapsulated in a space-
age silicone gel with nearly 4 times the dielectric strength of air. Balun connectors are triple-sealed to the coax. 

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