Not quite 'Lowfer', but definitely related by both practitioners and techniques. This is a 'Medfer' (MEDium frequency) capture of Dex's 'NC' at 510.510kHz - yes, just off the low end of the AM broadcast band. 400 miles between North Carolina and Pennsylvania doesn't seem like much until one realises that this is a true 'Part 15' transmission, i.e. less than 100mW of transmitter input power and an antenna less than 3m (about 10 feet) long. See Dex's write-up about the transmitter.