remote antenna for DCF77 clock

Hi sed!

Finally I finished my LASER clock which an analog DCF77 alarm clock
mounted on the ceiling and projecting a LASER beam around the room
at the wall as hour hand. But it turns out the signal is about zero
just below the ceiling :(( - measured with a DCF77 clock which
displays signal power from 0-5. Can I pick up the signal near the
window and route it with a coax cable to the clock? What antenna
should I use? Can I release the signal with an antenna, too, or
should I solder the coax into the clock? The clock has a ferrite
antenna. How about removing the ferrite antenna from the clock and
putting it via the coax cable near the window? Would the ferrite
antenna be a tuned antenna (resonating with a capacitor) and would I
need to retune it? Use some kind of terminating resistor?

Thanks, Bernhard
.

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