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
2 Replies
6375 Views
Last post December 30, 2024, 0839 UTC
by 26354
0 Replies
6918 Views
Last post February 07, 2023, 0315 UTC
by Shortwave_Listener
1 Replies
15193 Views
Last post July 19, 2022, 2354 UTC
by Ray Lalleu
47 Replies
38112 Views
Last post July 04, 2025, 0350 UTC
by 123
0 Replies
36 Views
Last post July 13, 2025, 0723 UTC
by Ray Lalleu
0 Replies
40 Views
Last post Today at 21:33
by Ray Lalleu
0 Replies
43 Views
Last post July 13, 2025, 1034 UTC
by Ray Lalleu
0 Replies
44 Views
Last post July 13, 2025, 1554 UTC
by Ray Lalleu
0 Replies
44 Views
Last post Today at 16:07
by Ray Lalleu
0 Replies
46 Views
Last post July 13, 2025, 1904 UTC
by Ray Lalleu
0 Replies
48 Views
Last post July 13, 2025, 2020 UTC
by Ray Lalleu
0 Replies
50 Views
Last post July 11, 2025, 1643 UTC
by Ray Lalleu
0 Replies
52 Views
Last post June 27, 2025, 2149 UTC
by Ray Lalleu
0 Replies
52 Views
Last post Today at 18:08
by Alex BLR
0 Replies
53 Views
Last post July 11, 2025, 1644 UTC
by Ray Lalleu
0 Replies
55 Views
Last post July 11, 2025, 1649 UTC
by Ray Lalleu
0 Replies
55 Views
Last post July 12, 2025, 1105 UTC
by TRI International
0 Replies
55 Views
Last post July 12, 2025, 2001 UTC
by Ray Lalleu
1 Replies
57 Views
Last post July 12, 2025, 1545 UTC
by Ray Lalleu
0 Replies
57 Views
Last post July 12, 2025, 1630 UTC
by Ray Lalleu

 

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