Casio 4390 Manual page 19

Approximate Reception Ranges
U.K. and German Signals
1,500 kilometers
Anthorn
500 kilometers
The Anthorn signal is
receivable within this
area.
Mainflingen
U.S. Signal
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
E-17