M2 Antenna Systems 440-18 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
06/09/15
Rev.03
Model ......................................... 440-18
Frequency Range ....................... 420 To 453 MHz
*Gain .......................................... 16.64 dBi
Front to back .............................. 23 dB Typical
Beamwidth ............................... E=27° H=32°
Feed type ................................... Folded Dipole
Feed Impedance. ....................... 50 Ohms Unbalanced
Maximum VSWR ........................ 1.2:1 Typical
Input Connector .......................... “N” Female
Power Handling .......................... 1.5 kW
Boom Length / Dia ...................... 137”’ / 1” To 3/4”
Maximum Element Length .......... 14”
Turning Radius: .......................... 69’
Stacking Distance ....................... 51” High & 52” Wide
Mast Size .................................... 2”
Wind area / Survival ................... 0.68 Sq. Ft. / 100 MPH
Weight / Ship Wt. ........................ 5 Lbs. / 7 Lbs.
M2 Antenna Systems, Inc.
Model No: 440-18
FEATURES:
The 440-18 is a computer optimized broadband yagi featuring an excellent pattern and good gain across its band-
width. It can be mounted vertically or horizontally and is ideal for stacking two or more for additional gain. Its light weight
yet sturdy construction keep the cost low and the performance high. Use it for ATV, OSCAR, FM, LONG HAUL TROPO,
ETC. We guarantee you will be impressed.
The heart of the 440-18 is a unique Driven Element Module with superior weather resistance and power handling
abilities. All connectors are O-ring sealed to the CNC machined block and internal connections are sealed in a space-
age silicone gel with a dielectric strength nearly 4 times greater than air. The Balun coax connectors are triple O-ring
sealed. Other key mechanical and electrical parts are CNC machined from 6061-T6 aluminum and all hardware except U-
bolts is stainless steel.
The 440-18 offers you uncompromising performance, enduring mechanical construction, and long term electrical
integrity. Where else but M
2
.
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd