This procedure gives instructions for construction of a one-quarter wave ground plane

antenna which can be used for transmission and reception. This antenna has the

capability of increasing the range of FM radios.

q Can only be used on a stationary vehicle and when a tree is available for suspension

of the antenna

q 1 soldier

q 30 minutes

q Cable, l-roll, telephone, WD-1/TT

(Five required)

q Rope

q Sticks or branches, 3-foot length, (three required)

q Repair broken metallic whip antenna. (Refer to para. 11-17.)

q Field expedient metallic whip antenna. (Refer to para. 11-18.)

q Field expedient replacement of fiberglass antenna. (Refer to para. 11-20.)

1.

Determine the length of wire needed for the radiating element of a one-quarter

wave antenna using the following formula:

. 234 divided by frequency (MEGAHERTz)

Length (feet)

or

Length (meters)

= 71.37 divided by frequency (MEGAHERTZ)

Example- A radiating element for a frequency of 50 MHz

L (feet)

= 234 divided by 50 MHZ = 4.68 feet

or

L (meters)

= 71.37 divided by 50 MHZ = 1.43 meters

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