rickman wrote in :

I have a project in mind that would need a very good antenna in the
frequency range of 60 kHz. Originally I looked at loop antennas and
liked the idea of a large shielded loop made of coax tuned with a
capacitor. My goal is to get as large a signal as possible from the
antenna and matching circuit to allow the use of a receiver with very
low sensitivity... in fact an all digital receiver.


MSF time signals? Just a thought... If you're interfacing an analog signal to
digital, one trick I used (for audio but it ought to help here too) is a
CA3140 with a bit of positive feedback through a few Mohms for hysteresis to
clean the signal a bit. The resulting Schmitt trigger, powered by about 5 or
6V, could be sensitive to take a lot of strain off your antenna. Whether this
alone gives you enough gain I don't know, but it is cheap to try.