Junghans Mega Radio Controlled Watch
Optimal position to receive time signal for synchronization

How does it work?
Every night between 2 AM and 3 AM on even days and between 3 to 4 on uneven days, the watch will try to automatically synchronize to the long-wave time signal from the University of Braunschweig.
The time signal is a string of information sent out during the whole day and night, but the watch will try to automatically synchronize at a time, the air is "cleaner". Heavy industrial and private use of long-waves "pollute" the signal and might prevent the watch to synchronize during day time. I have to say, that I synchronized the watch many times manually, and that I never encountered a situation where the time signal could not received. The watch then reads the time signals time and compares it to its internal quartz time and eventually makes the current adjustments.
The watch can be set using the push buttons (better visible on the next page) and the watch also displays the number of days since the last successful synchronization. The position above is the one recommended by the manual to guarantee maximal signal reception.
The radius of Braunschweig's sender covers most Central Europe. I also had not problems when staying in Southern England. Rugby is the location of the English time signal, but I doubt, that this Junghans could synchronize with that time signal. Please also see the Citizen 3-Band RC watch that synchronizes to Braunschweig (EUR), Rugby (UK) and Tokyo (JPN).