Freeview and Sky Radio Stations
Freeview and Sky radio logos can be automatically added and updated using the LogoManager plugin, available through MediaPortal Extension Manager and from here.
Christchurch Radio Stations
Images should be .png extension and have the same filename as the radio channel name in tv server setup
Win XP - C:\Documents and Setting\All Users\Application Data\Team Mediaportal\Mediaportal\Thumbs\TV\Logos
Vista / Win 7 - C:\Program Data\Team Mediaportal\Mediaportal\Thumbs\TV\Logos
Win XP - C:\Documents and Setting%user%\Local Settings\Application Data\Team Mediaportal\Mediaportal\Thumbs\TV\Logos