broadcasting in the Soviet Union
...that broadcasting in the Soviet Union was so secretive that they didn't disclose the frequencies the domestic radio stations operated on, thus leaving SWLs wanting to tune into Soviet radio to memorize the frequencies and remember where the sites were?
...that <b id="mwAyk"><a href="./Broadcasting_in_the_Soviet_Union" id="mwAyo" rel="mw:WikiLink" title="Broadcasting in the Soviet Union">broadcasting in the Soviet Union</a></b> was so secretive that they didn't disclose the <a href="./Frequency" id="mwAys" rel="mw:WikiLink" title="Frequency">frequencies</a> the domestic <a class="mw-redirect" href="./Radio_station" id="mwAyw" rel="mw:WikiLink" title="Radio station">radio stations</a> operated on, thus leaving <a class="mw-disambig" href="./SWL" id="mwAy0" rel="mw:WikiLink" title="SWL">SWLs</a> wanting to tune into <a href="./Soviet_Union" id="mwAy4" rel="mw:WikiLink" title="Soviet Union">Soviet</a> <a href="./Radio" id="mwAy8" rel="mw:WikiLink" title="Radio">radio</a> to memorize the frequencies and remember where the sites were?