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
334 Views
Last post August 16, 2025, 0131 UTC
by Radiouser
1 Replies
209 Views
Last post November 11, 2025, 1756 UTC
by DXerKen
3 Replies
848 Views
Last post April 04, 2025, 2344 UTC
by myteaquinn
2 Replies
743 Views
Last post September 02, 2025, 1937 UTC
by myteaquinn
8 Replies
560 Views
Last post November 21, 2025, 1252 UTC
by RainBrandy
0 Replies
299 Views
Last post September 14, 2025, 0159 UTC
by Radiouser
8 Replies
288 Views
Last post Today at 09:26
by RainBrandy
4 Replies
876 Views
Last post December 02, 2024, 1429 UTC
by aurora
4 Replies
998 Views
Last post May 10, 2025, 0213 UTC
by Molvania Poacher
1 Replies
500 Views
Last post December 19, 2024, 1504 UTC
by Sealord
2 Replies
693 Views
Last post May 27, 2025, 0123 UTC
by Molvania Poacher
1 Replies
286 Views
Last post October 06, 2025, 1200 UTC
by Radio Star
1 Replies
1147 Views
Last post June 15, 2025, 0258 UTC
by myteaquinn
1 Replies
234 Views
Last post October 13, 2025, 2348 UTC
by Treehouse SWL
1 Replies
588 Views
Last post February 01, 2025, 0404 UTC
by Molvania Poacher
2 Replies
887 Views
Last post July 05, 2025, 1716 UTC
by Radio Star
7 Replies
565 Views
Last post October 22, 2025, 1342 UTC
by ChrisSmolinski
4 Replies
1088 Views
Last post February 21, 2025, 1217 UTC
by ChrisSmolinski
1 Replies
558 Views
Last post July 28, 2025, 0338 UTC
by Treehouse SWL
4 Replies
251 Views
Last post November 02, 2025, 0050 UTC
by hsmith77

 

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