The basic purpose of an antenna is to increase the receptive power of the device it's attached to. You can make a simple FM antenna that will increase the reception of any FM receiver that has an antenna port as part of its construction. You will need a few parts from a hobby or electronic store and some experience in using a soldering iron to properly make the FM antenna--however, no electrical skill is required.
1. Measure out 3 feet of the electric wire from the spool. Cut the electric wire using the wire cutters.
2. Unscrew the black plastic insulator plug off of the 2.5mm phone plug.
3. Strip off 1/2 inch of insulation from the end of the electric wire using the wire strippers.
4. Cut a 1-inch piece of the heat shrink tubing with the scissors. Push the piece of heat shrink tubing over the end of the wire that has just been stripped.
5. Solder the end of the wire to the inner terminal on the 2.5mm phone plug that has the wire hole in it.
6. Slide the heat shrink tubing down over the inner connector. Screw the black plastic insulator back onto the the 2.5mm phone plug.
7. Plug the 2.5mm phone plug into the antenna port of the FM device. Unfurl the electric wire.
The antenna, as shown in the diagram below, is square and is made by wrapping wire
around a frame of crossing rods.
If you are an avid AM radio listener, whether it be on a old fashioned radio, a new AM/FM radio or a shortwave radio, you know it is a bit of a challenge to pick up the radio signal from the AM frequency. There are a lot of things that can cause interference, but with the right radio and a good antenna you can listen to stations from a thousand miles away.
FM transmitters are usually battery driven, but some use the cigarette lighter socket in cars, or draw their power from the device itself. They are typically used with portable audio devices such as CD or MP3 players, but are also used to broadcast other outputs (such as that from a computer sound card) throughout a home or other building.