If you would like to remove RadioLover completely from your system, remove the main application file, and also delete the following files depending on your version.

1.3 and up

HOME/Library/Application Support/RadioLover
HOME/Library/Preferences/com.bitcartel.radiolover.plist

Earlier than 1.3

HOME/Library/Preferences/RadioLover Preferences
HOME/Library/Preferences/org.bitcartel.radiolover.plist