Many thanks to SRAA contributor, Joel Benavidez, who notes:

Amateur radio operator Joel Benavidez, KF5UNI from San Antonio, Texas made the recording in his home using the internet and the magic of Software Defined Radio or "SDR". SDR allows anyone with an internet connection to monitor someone else's radio over the internet. In this case, Amateur radio operator Louis Brown, KD4HSO in Kansas.The Show "DXers Unlimited" is a ham radio oriented "techy" show out of Cuba, known to, and respected by Ham radio operators the world over.Starting time: 0515Frequency: 6.099 MHzLocation: Remote Recording made in San Antonio, Texas (HamGridSquare EL09ql) by station KF5UNI from station KD4HSO in Kansas USA (HamGridSquare: EM28qw)Your receiver and antenna: OpenWebRX Software Defined Radio (SDR) over http://sdr.hu with receiver at http://64.136.200.36:8073