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Select a suitable mount for the MFJ-1438.  The MFJ-345S and 
MFJ-348S trunklip mounts or the MFJ-336S Goliath triple mag-
mount are recommended. 

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Be sure the mount has a good connection to ground (this is 
most important).

 

• 

Screw the MFJ-1438 onto your mount. 

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For added support, it is suggested that you guy the top of the 
antenna. 

 

Tuning 

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The bandwidth on the 10-Meter and 6-Meter bands is very narrow.  
Tuning may be required depending on the part of the band you 
want to operate. 

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To adjust the frequency there are two stubs: the top stub is for the 
10-Meter Band and the side stub is for the 6-Meter band. 

• 

For operating at the top of the band, it may be necessary to cut one 
or both stubs. 

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Use the hex key supplied to loosen the setscrew, and adjust the 
stub length. 

• 

Tighten the setscrew securely after tuning is complete. 

 

Notes: 

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Tuning this antenna for the 10-Meter band will affect the tuning on 
the 6-Meter band.  Tuning this antenna for the 6-Meter band will 
affect the tuning on the 10-Meter band.  After tuning for one band 
is complete, go back and recheck the tuning on the other band. 

• 

Be careful if you have to cut the stubs to tune this antenna, it is 
recommended not to exceed increments of 0.1 inches. 

• 

This antenna is very sensitive.  You may find that switching 
vehicles adversely affects the operation.  It may be necessary to re-
tune the antenna when switching vehicles. 

 
Fold-Over Feature 

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Unscrew the threaded collar at the base of the antenna. 

• 

Lift the antenna up until the hinge is revealed. 

• 

Gently fold the antenna over in a suitable position for temporary 
storage. 

Warning: 

• 

Do not touch the antenna while in use. 

• 

Place the antenna in a location away from people.  Serious RF 
burns may occur if a person comes in contact with the antenna. 

• 

NEVER INSTALL AN ANTENNA IN A LOCATION 
WHERE CONTACT WITH POWER LINES IS POSSIBLE.  
DEATH OR SERIOUS INJURY MAY OCCUR.

 

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