Many inexpensive receivers are unable to separate adjacent stations with different signal strengths.
These radios lack selectivity, and many people find that only extremely strong signals can be received without adjacent channel interference. This lack of selectivity lessens the listening enjoyment and gives a false impression of shortwave interference. When signals are perceived by the listener as being weak, orientation and length of the internal whip antenna may improve reception. We do not recommend adding external outside long wire antennas to inexpensive receivers, because of the lack of their ability to handle the increased signal levels of all the stations on the SW dial. Outside antennas can cause an overload of the receiver and the internal production of images that can cause stations to be heard on frequencies that are not their own.