Propagation Summary :: 7.0 - 7.3 MHz (40m)

The popular 40 meter band has a clearly defined skip zone during the day due to insufficient ionization to refract high angles.
D layer absorption is not as severe as on the lower bands, so short-distance skip via the E and F layers is possible.
During the day, a typical station can cover a radius of approximately 800 km (500 mi). At night, reliable worldwide communication via F2 is common on the 40 meter band.
Atmospheric noise is much less troublesome than on 160 and 80 meters, and 40 meter DX signals are often of sufficient strength to override even high-level summer static. For these reasons, 40 meters is the lowest-frequency amateur band considered reliable for DX communication in all seasons.
Even during the lowest point in the solar cycle, 40 meters may be open for worldwide DX throughout the night.