We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Subject / Started by Last post
0 Replies
601 Views
Last post December 26, 2023, 0530 UTC
by ~SIGINT~
11 Replies
601 Views
Last post August 04, 2025, 0206 UTC
by Sarge94
1 Replies
601 Views
Last post November 10, 2018, 1645 UTC
by PirateSWL
0 Replies
601 Views
Last post March 22, 2022, 2340 UTC
by ~SIGINT~
6 Replies
601 Views
Last post October 10, 2025, 1141 UTC
by DXerKen
1 Replies
601 Views
Last post April 04, 2022, 2351 UTC
by refmo
0 Replies
601 Views
Last post June 24, 2018, 2320 UTC
by PirateSWL
1 Replies
601 Views
Last post November 01, 2023, 1444 UTC
by Markokpik
1 Replies
601 Views
Last post April 24, 2023, 0007 UTC
by Chuck54
2 Replies
601 Views
Last post February 21, 2024, 2210 UTC
by Ct Yankee
1 Replies
600 Views
Last post October 18, 2020, 2325 UTC
by Chuck54
3 Replies
600 Views
Last post October 03, 2025, 1653 UTC
by AlexRadioDX
2 Replies
600 Views
Last post June 12, 2022, 0113 UTC
by flexoman61
1 Replies
600 Views
Last post December 04, 2021, 0139 UTC
by Bali_Frank
2 Replies
600 Views
Last post June 15, 2022, 0150 UTC
by Sky Waves
2 Replies
600 Views
Last post April 25, 2025, 1550 UTC
by ChrisSmolinski
3 Replies
600 Views
Last post January 29, 2023, 1622 UTC
by Andrew Yoder
0 Replies
600 Views
Last post December 24, 2018, 1644 UTC
by R4002
0 Replies
600 Views
Last post May 04, 2018, 1226 UTC
by ChrisSmolinski
0 Replies
600 Views
Last post January 13, 2018, 1917 UTC
by ChrisSmolinski

 

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns