M2 Antenna Systems 32 HO LOOP, 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 

©2011 M2 Antenna Systems Incoporated 

11/02/11 

Rev.01 

M2 Antenna Systems, Inc. 

Model No: 432 HO LOOP 

Model  ......................................... 432 HO LOOP 
Frequency Range ....................... 430 To 436 MHz 
Gain, Single @ 86 IN ................. 5.0  dBd  @ 4 deg. 
Gain, Stack @ 84 IN & 100 IN ... 8.8 dBd @ 4 deg. 
Polarity  ...................................... Horizontal Omni 
Impedance ................................. 50 Ohms, Unbalanced 
Power Handling. ......................... 800W,  1.5  kW for Stack

Feed Connector .......................... Type “N” Female 
Mounting ..................................... 3/8-24 
Vehicle Mounting  Height ...........  6” or more 
Stacking Separation ................... 16” 
Wind Area ................................... 0.015 sq ft. 
Weight ........................................ 7 oz. 
 
 

FEATURES: 

The new 432 HO LOOP provides easy SSB and CW communications out to 200 miles or more. HO LOOPS produce an omni-

directional, HORIZONTALLY polarized signal ideal for mobile and base operations. Horizontal polarity permits the HO loop to pick up 5 
dB from ground gain that verticals don’t get. As with most horizontally polarized antennas, performance improves dramatically with 
height above ground. By stacking two HO LOOPS, another big gain jump occurs (see pattern and note the great reduction of high an-
gle lobes). For terrestrial use, the HO LOOP does not need groundplane, so mounting options are simplified. Mounting over a car roof 
at 6 to 10 inches produces 2.5 dBd gain dome shaped pattern upward for LEO satellite operation while still maintaining modest terres-
trial performance. Physically, the 432 HO loop is a 4.313” square loop, fabricated from two 1/4” dia. aluminum rods to minimize losses. 
The sealed feed block provides weather protection with minimum wind drag. The heart of this unique design is the shorted stub match-
ing to a 50 ohm coax feedline. Mounting is via a single 3/8" hole ( standard for most mobile hardware). For more performance, try the 
HO LOOP-STACK PACKAGE:2 HO LOOPS, phasing lines, “T” junction block, upper and lower  1/2”  mast sections.  For easy base-
station installation, use the optional wall or mast mounting bracket and U-bolts. For a powerful mobile signal, stack and array of HO 
LOOPS on our optional “BIG FOOT”, mag-mount shown above). Use the optional 5” magnet and the 18" mast for single band mobile 
operation. 

SPECIFICATIONS: 

*Subtract 2.14 from dBi for dBd