WWV at 25.0 MHz can give you a hint about low band being active. I've scanned the remote broadcast pickup channels in the 26 MHz range for signs of life. 26.11 and 26.13 seem to be the most active, at least from what I can pick up. The 33 MHz fire frequencies are also a good indicator. Search from 33.44 to 33.98 and see what you hear.