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4402 N. Selland Ave, Fresno  CA 93711  (559) 432-8873  FAX (559) 432-3059 

www.m2inc.com  Email:  [email protected]  

TOOLS REQUIRED: #2 Phillips head screwdriver, 11/32 nut driver and 7/16” socket open end wrench. 
1.  Unpack the factory assembled HELICAL antenna, the CENTER REFLECTOR PLATE, and the two (2) REFLECTOR 

HALVES. Attach the Reflector halves to the Center Reflector Plate using 8-32 x 3/4” screws and locknuts. 

2.   Add the g-plane clamp #1 to the center reflector plate near the center hole using 1/4-20 x 3/4 bolts and lock wash-

ers. Then slide the assembly up the rear end of the helix boom.  Align the hole in the rear boom section of the helix 
assembly with that of the g-plane clamp #1 and use a 1/4-20 x 3/4” bolt to set the position of the ground plane by 
threading the bolt through the g-plane clamp #1 and into the boom. This sets the position of the  ground plane. Then 
add the g-plane clamp #2 and secure using 1/4-20 x 2 1/2 bolts and locknuts.  

3.  Slide the feed support block on to the helix, note that the hole in the support block is off set, install the block so there 

is the greatest distance between the helix and the ground plane. Align the holes on the ground plain and leave loose 
at this point. Then slide the ‘N’-connector block assembly on the helix and rotate the connector down through the 
large hole in the plate. Secure the block to the plate with four (4) 8-32 x 1-1/2” screws and locknuts. Add the 1/4-20 
bolt through the feed block support and ground plane and secure. Now install the 1/4-20 x 1/4” set screw in the 
round end of the feed block assembly and tighten, using the supplied 1/8” Allen wrench. Note set screw markings 
from original test assembly. Helix should protrude no more than 1/8” past the feed post. This completes the assem-
bly. 

400-800-8 HELICAL ASSEMBLY MANUAL 

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