In your Profile settings, there is a section called Forum Profile Information. Here you can set your Signature, which appears at the bottom of any messages you post. It's a great place to put your location, types of radios and antennas used, etc. When you post loggings, knowing your location is very handy, as other listeners can use that information to decide whether or not they should try to listen to that station.
Of course, you may have reasons to obfuscate your location, so feel free to be as precise or imprecise as you wish. (Or not set it at all if you feel the need, of course)