Thanks, Mike.
I expected interference from cheap switchers, but not from a Tektronics scope several feet away. Another design using the original CMMR-6 receiver had to shield the antenna from the LCD display. Aside from the scope problem, I got pretty stable reception in my log home late at night. It was a little sporadic during the day, so I coded a simulator to facilitate coding the receiver. Once that is all done, I will fiddle with antennas and certainly refer back to the link you provide. I would like the clock to be usable in the same room I have my other electronic toys.
John