This was also sold as the Radio Shack DX-440 20 years ago.....
http://www.radiointel.com/review-ats803a.htm

Try any of the WWV or WWVH stations.... At night, check 5000mhz,
2500mhz and during the day 15000mhz or 10000mhz.

You should always be able to get one or several of those at anytime.

From dusk and during the night, turn from 5800mhz to 6300mhz and
during the day, try 11400mhz and above.

For the hams, check 3600-4000mhz at night with the BFO.