Topband: Skip zone on different bands

[Ignacy Misztal]

Now for 2 weeks my QTH hears a static-like S9+ noise on 160m, 80, and to a
less extent, 40m. No static heard on 30-10m. Makes 160/80m bands useless.
Beverages and 4 sq point to the East.

Seems the static is just within the ground wave of 40m but beyond that of
30m. Does anyone know the extent of the ground wave on different bands?

If the static is that strong from far away, does it make sense to trace it
or can one expect that it will burn itself out?

Ignacy NO9E