I need an antenna for RCA RP7664A portable radio. What kind should I look for?
There are 4 things you need to look at for the replacement, the two most important details are how the antenna is attached inside the radio, and the second is the outside diameter of the antenna. The other two details are the collapsed length and extended length. You will need to open the radio to see what attachment method is used, usually a small screw through a hole through the base at the end of the antenna. There will also be a wire attached with the screw (usually), that connects to antenna to the radio circuits. Carefully remove the broken antenna from the radio, then you can note the attachment method, and measure the outside diameter, and the collapsed length.
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