If it loses the frequencies immediatly then it sounds like the capacitor that holds the charge for the memory has gone out. If it is sitting for a few days and loses frequencies this is more common. Solution, if you've had it less than a year, take it to your local radioshack, try to find the receipt and have them send it to the repair center for you.
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The screw-in antenna for your scanner is Radio Shack Catalog number 10538353. You should be able to purchase one, or order one, from your local Radio Shack. Also check eBay - but make sure that it's the correct antenna for you scanner. Not all screw-in antennas have the same thread size. Check prices closely. Considering the age and limited capability of your scanner, you might be better off purchasing a new or used scanner rather than an antenna for the 508.
The RESET function will clear everything that you have programmed into the scanner and restore original factory settings. You can, however, restore the 150 pre-programmed frequencies after a RESET.
To RESET: - Power the scanner OFF. - Hold down the 2, 9, and PSE keys and power the scanner ON. - CLEAr appears on the display as the scanner resets. - Do not power the scanner OFF until CLEAr disappears from the display.
To restore the original 150 pre-programmed frequencies: - Turn the scanner power OFF. - Hold down the 3 and ENT/PGM keys and power the scanner ON.