As the weather warms and humidity rises, you may experience problems tuning in some of the WSHU Public Radio Group’s frequencies. This is due to a phenomenon called ducting. Ducting occurs when radio waves are trapped below or between layers of the atmosphere having different air temperatures. It is the same phenomenon which can hold layers of smog or humidity close to the earth. It often occurs when there is a sudden weather change such as the arrival of a cold front, or it can be the result of a stagnant hot air mass. The trapped signals are "ducted" for many miles beyond their normal range. This allows distant signals to reach our listening area and interfere with local stations. The condition can last from a few minutes to a day or more, but will often abate after sunset or sunrise when temperatures change.
On-line streaming is not affected by ducting. You can find links to our streams at http://www.wshu.org.