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The 159.15 D.C. Police freq has always been listed as Citywide - a simulcast of TG16624 - and that's what the database shows it to be. However, every time I run across it, it is simulcasting District 1, TG16400 - as it is tonight. Is this a change? Do they switch it around occasionally? Is it only coinicidence that it's District 1 each time I tune into it?