Hi Chris,
try to make a rectangular coil, about 1 ft x 1 ft, some 30 turns wound
by a fairly thin magnet wire (#25 to #30). Bring it into resonance at
60 kHz by a capacitor, some 8000 - 10000 pF. Place the coil
vertically, aiming to the transmitter, and place the clock to its
center. You do not need any mods of the clock. The signal should be
significantly stronger.

BR from Ivan

(Chris Campbell) wrote in message om...
I'm trying to get a radio clock to sync up with WWVB (60 kHz out of
Colorado). In the place that I want to place the clock, I can not get
it to sync, even at night when the signal is stronger.

Inside the clock is a small ferrite-core loopstick antenna. I figured
out which way the gain pattern pointed on the thing (i.e. not along
the axis of the ferrite rod) and tried positioning the clock for
maximum signal, but no luck. ...