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I am in NE Iowa by the River. My frequency counter picked up 173.25 transmitting nearby. I tuned the scanner to that frequency and I was hearing the County's law enforcement repeater signal (which has an output in the 155 mhz range) being transmitted. This lasted for about a half hour and I haven't heard it since. We don't even pick up the repeater very well in the River valley, but this was a very clear and strong signal. The FCC frequency database indicates this frequency is used by a few utility gas companies in Iowa, but none that are based close by. Any ideas?