49 MHz Range Testing - Fringe Unknown Transmitter 49.860 MHz

At the beginning of the video you can hear audio on the 49.86 MHz carrier frequency. Unlike the numerous transmitters on 49.830 MHz, the two on 49.870 MHz / 49.875 MHz, and the 49.85 MHz and 49.845 MHz UNIDs, I have no idea where this UNID transmitter is. Given the range of 49 MHz on this receiver setup, it could be a fair distance away. 49 MHz band range testing 49MHz band range 55 MHz band VHF low band VHF-lo low band VHF 30-50 MHz 30-54 MHz 25-50 MHz 27-960 MHz 25-1300 MHz