Many radio signals in the medium and long wave bands (MW/LW) but also shortwave (SW) are infested by noise of wide variety and of such levels that weak stations are virtually obliterated. The worst noise is the wideband variety which stretches across several hundred kilohertz across the band. However the very fact that the noise is wideband in nature allows it to be suppressed using a little known and inexpensive method of using a second receiver tuned just beside the frequency you want to listen to.
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