「BCL ブーム」Radio Japan is only one

In 1990, Nippon Broadcasting System (JOLF) sued its rival Radio Nippon to prevent it from using both the "R.F. Radio Japan" and "Radio Japan" trademarks. Nippon Broadcasting System lost the lawsuit.
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en.wikipedia.o...
This is JORF R.F. Radio Nippon formerly known as Radio Kanto 1240 AM (50 kW Yokohama, Japan) with ID 1:20 as "Radio Nippon". Received on August 7th 2020 in Northwestern Siberia of Russia. Picture was taken from jswc3242.web.fc...