I have one of the MFJ "atomic" clocks in my basement shack (in New York) It
will not pick up the WWV signal in the basement, but does fine when upstairs
and placed in a vertical position. There is no external antenna
connector---that would make things too easy. Is there an accepted way to
connect an external antenna? Any experience with external antennas on these
things? (This should be a very common problem!)

I have not taken it apart yet -- sometimes such things are easier to take
apart than to put back together. I am quite willing to take it apart if
there is a good reason for doing so.

Bill
W2WO