M2 Antenna Systems 20M5-125 Manual
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2016 M2 Antenna Systems Incorporated
01/20/16
Rev.02
Model ......................................... 20M5-125
*FR / (G) FS / (G) OG . ............... 14.0-14.350 / 10.2dBi / 15.8dBi @70’
*FR / (G) FS / (G) OG ................. 14.1-14.350 / 10.3dBi / 15.9dBi @70’
*FR / (G) FS / (G) OG ................. 14.1-14.225 / 10.6dBi / 16.0dBi @70’
*FR / (G) FS / (G) OG ................. 14.0-14.300 / 10.2dBi / 15.8dBi @70’
Front to back ............................... 24 dB Typical
Beamwidth ................................ E=50° / H=64°
Feed type .................................... Hair pin match
Feed Impedance. ........................ 50 Ohms Unbalanced
Maximum VSWR ........................ 1:2.1
Input Connector ....................................... SO-239, Others avl.
Power Handling ....................................... 3 kW, Higher avl.
Boom Length / Dia .................................. 44’ / 3” x .125 Wall
Element Length / Dia. .............................. 36.5’ / 1-1/2” To 1/2”
Turning Radius: ....................................... 32’
Stacking Distance ................................... 48’ To 62’
Mast Size................................................. 2” to 3” Nom.
Wind area / Survival ................................ 12 Sq. Ft. / 125 MPH
Weight / Ship Wt. .................................... 135 Lbs. / 161 Lbs.
M2 Antenna Systems, Inc.
Model No: 20M5-125
FEATURES:
The 20M5-125 is the perfect balance between wind area and performance. It features improved gain and F/B across
the 20 meter band. The 20M5-125 mph is computer optimized mechanically for maximum strength for it’s wind area.
Mother nature will hate this one! Two different optimization options allow the antenna to be customized for your
bandwidth and performance preferences, Plots with gain and F/B figures are supplied. Physically, the 20M5-125 Yagi
features tapered elements, each element is secured with a pair of machined, 1/2” thick aluminum boom-to-element clamp
plates. The clamps also permit spacing adjustments on the 3” x .125” wall boom. Elements taper in size from 1-1/2” to the
adjustable 1/2” tips and are single and double sleeved at critical points to achieve a 125 MPH wind survival rating. All
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd / FR = Frequency Range / G = Gain / FS = Free Space / OG = Over Ground