London Info
I've never called up London Information since I've always planned routes with airfields en-route to talk to. When you speak to London Info, you must be in LOS with a reciever tower. For aircraft flying at low altitudes, maintaing contact with London Info across large areas of the UK with one frequency would require many towers. So if I talk to London, then other aircraft near me would hear my call, but those over the horizon would not. However, all aircraft would hear the reply from the controller. Is that right?
Does the system use the same network of transmitter towers as D&D 121.5?