M2 Antenna Systems 420-50-11, Assembly Manual

Tools handy for assembly process: screwdriver, 11/32” spin-tite or socket, 7/16” and 1/2” end 

wrenches / sockets, measuring tape.

1.  This antenna uses a one-piece boom. A factory installed 7/8” x 29” sleeve provides additional 

boom strength for rear mounting the antenna. Check that sleeve is in position, flush with rear end 
of boom and all holes are aligned with boom. 

 
2.  Lay out the elements by length and position as shown the DIMENSION sheet. Start with the 

reflector (longest) element and push on a black button insulator to about 1/2” from center. Push the 
element through the holes 1/2" from the rear of the boom and install the second button, snugging it 
up into boom. DO NOT BOTHER WITH ACCURATELY CENTERING the element at this time and 
DO NOT INSTALL the stainless steel internal locking “KEEPERS” yet. This is easier to do after all 
the elements are installed in the boom. 

 
3.  Install the 3/16” rod DRIVEN ELEMENT as you did the reflector. Then continue with the installation 

of the DIRECTORS. 

Note that the Director Elements do not consistently diminish in length 

from rear to front, so pay close attention to length and position. 

4.  Now begin centering the elements. Use a tape measure to EQUALIZE the amount the element 

sticking out on each side of the boom. Once you have all the elements centered, sight down the 
element tips from the rear comparing each side. Look for any obvious discrepancies and correct if 
found. 

 
5.  Install the stainless steel SHAFT RETAINERS to secure the elements. NOTE: For portable or 

temporary use of the antenna, the retainers may be left off. The button insulators, normally a tight 
fit, hold the elements quite securely. 

To install, use thumb and forefinger to hold the retainer over the end of the PUSH TUBE ( 3/8" x 3" 

420-50-11 ASSEMBLY MANUAL