Use this forum to ask tech questions or post info about hardware. Post can include computer, radio, antenna and accessories as long as they are Amateur Radio related.
There are a bunch out there but be careful. Some are pretty poor. West Mt Radio has a good one and the Manhattan brand is pretty good. Either will probably run you about $35 or so. I have a shoebox half full with $7-$10 ones that don't work. Some times you get what you pay for. Depends a bit on what you actually need it for.