but as I understand things, there is nothing else at all as "fast" as a radio transmission. LW and FM are effectively instantaneous, whereas your hearing of a time signal over the internet will be delayed by whatever your decoding device does to it. Apparently you can't even listen to music on digital radios in 2 adjacent rooms as it will not be in synch.The way to increase transmission range these days is online rather than LW transmitters.
I don't know what controls my "radio" clock but it is exactly right by the FM radio pips...