KEFX is a radio station broadcasting from Twin Falls, Idaho, and airing a Christian Rock format. The station operates on a frequency of 88.9 MHz FM with an effective radiated power of 100 kW at 302 meters above average terrain and is owned by The River Christian Fellowship, (formerly Calvary Chapel of Twin Falls. KEFX broadcasts under the name Effect Radio, and its broadcast is sent to 58 translators across the United States. It is a sister network to the much more widely distributed CSN International.
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