If you have an FM receiver with a jack for an external antenna, you'll note that the jack is usually specified for 75-ohm antennas. If you're unfamiliar with an antenna design, building an antenna that will work at a specific resistance may seem like a difficult task. But it actually isn't--you can build an antenna that works with a 75-ohm input fairly easily and inexpensively.
Step 1
Cut a 30-inch length of 300-ohm twin lead cable. Don't be concerned that the cable is a 300-ohm cable and you're making a 75-ohm cable. The cable is merely used as the active element that receives the signal.
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Step 2
Remove 1/2 inch of insulation from the both ends of the cable. Twist together the separate leads at each end of the cable.
Step 3
In the middle of the cable, cut one of the two elements of the cable and remove 1/2 inch of insulation from either side of the cut with your wire strippers.
Step 4
Solder each bare wire from the middle cut to one of the tabs of a 300- to 75-ohm transformer.
Step 5
Connect one end of the coaxial cable to the transformer by plugging it in.
Step 6
Connect the other end of the coaxial cable to the antenna input of your receiver.
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