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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.03 

Model  ........................................ 20M6-125 
Frequency Range ...................... 14.0– 14.350 MHz 

*

Gain, (FS) / Over gnd ............... 11.19dBi / 16.6dBi @70’ 

Front to back .............................. 25 dB Typical 
Beamwidth   ............................... E=46° / H=60° 
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 ..................... 59’ / 3.0 x .125 Wall 
Element Length / Dia. ................ 36.5’ / 1 1/4” –1/2” 
Turning Radius: ......................... 40’ 
Stacking Distance ...................... 65’ -70’ 
Mast Size ................................... 2” to 3 ” Nom. 
Wind area / Survival .................. 16 Sq. Ft. / 125 MPH 
Weight / Ship Wt. ....................... 240 Lbs. / 270 Lbs. 
 

M2 Antenna Systems, Inc. 

Model No: 20M6-125 

FEATURES: 

            The 20M6-125 is a medium spaced, high performance, 

full band coverage

 6 element Yagi, computer optimized to 

squeeze the last drop of performance from this boom length. The design provides virtually flat gain, exceptional front to 
back and excellent VSWR never exceeding 2:1 at the upper band edge.  Larger, sleeved elements and boom provide the 
125 MPH wind survival factor. Construction includes machined boom to element mounting plates and a rugged hairpin 
match. This antenna will be in the air for many years, keeping you on the top of the pileup in spite of Mother Nature! 
There is no finer, stronger antenna available today.  

 

 

SPECIFICATIONS: 

*Subtract 2.14 from dBi for dBd /  FS = Free Space 

Summary of Contents for 20M6-125

Page 1: ...rvival 16 Sq Ft 125 MPH Weight Ship Wt 240 Lbs 270 Lbs M2 Antenna Systems Inc Model No 20M6 125 FEATURES The 20M6 125 is a medium spaced high performance full band coverage 6 element Yagi computer opt...

Page 2: ...20M6 125 DIMENSION SHEET NOTE HAIRPIN HAS BEEN ROUTED TO THE REAR OF ANTENNA SEE HAIRPIN ADDENDUM FOR MORE INFORMATION...

Page 3: ...20M6 125 ASSEMBLY DETAILS...

Page 4: ...20M6 125 HAIRPIN ADDENDUM NOTE HAIRPIN HAS BEEN ROUTED TO THE REAR OF ANTENNA TO AVOID INTERFEARENCE WITH OVERHEAD SUPPORT EYEBOLT...

Page 5: ...element centering again and then tighten the clamp block bolts evenly to keep the plates parallel Repeat for the other two PARASITIC ELEMENTS 4 DRIVEN ELEMENT ASSEMBLY Refer to the HARDWARE ARRANGEME...

Page 6: ...ith both outer and inner overhead support systems The outer support system uses the supplied wire rope assemblies Install turnbuckle plate to your mast at 48 minimum from your boom Before hooking turn...

Page 7: ...of the assembly using the supplied wire nuts cable eye and turnbuckle as shown below In some WIRE ROPE Note Picture below is used only to show overhead support wire rope assembly detail Boom other com...

Page 8: ...GENERIC COMPRESSION CLAMP DETAIL NOTE Generic layout to show how compression clamps work Your antenna may have one or the other or may even have both compression clamp sizes...

Page 9: ...UBE 3 8 X 40 2 ELEMENT CLAMP BLOCK 3 X 6 X 1 2 M2AEC0041 12 MACHINED CRADLE 3 LD M2AMC0136 12 BALUN 1 1 3 30 MHZ STANDARD 1 TURNBUCKLE PLATE 2 X 5 X 25 M2APT0110 2 WIRE ROPE 1 8 X 334 WITH 3 8 FORGED...

Page 10: ...59 NUT 5 16 18 SS 14 LOCKWASHER 5 16 SS 14 NUT 3 8 16 SS 18 LOCKWASHER 3 8 SPLIT RING SS 18 SCREW 8 32 X 1 3 4 SS 24 SCREW 8 32 X 1 1 2 SS 24 SCREW 8 32 X 1 1 4 SS 24 SCREW 8 32 X 1 2 SS 12 NUT 8 32...

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