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
499 Views
Last post September 24, 2023, 0239 UTC
by myteaquinn
10 Replies
1467 Views
Last post September 24, 2023, 0034 UTC
by shadypyro
10 Replies
1504 Views
Last post November 06, 2022, 1829 UTC
by ✠ Blue Max
13 Replies
674 Views
Last post October 07, 2025, 2245 UTC
by Shortwave_Listener
13 Replies
1580 Views
Last post November 01, 2024, 0028 UTC
by GeorgeLeroyTirebiter
8 Replies
1409 Views
Last post November 09, 2024, 2149 UTC
by N2MLP
9 Replies
1962 Views
Last post October 05, 2019, 1518 UTC
by ChrisSmolinski
11 Replies
3341 Views
Last post May 12, 2013, 0117 UTC
by refmo
0 Replies
2042 Views
Last post October 13, 2008, 1010 UTC
by Zoidberg
10 Replies
1535 Views
Last post May 14, 2022, 1230 UTC
by ChrisSmolinski
8 Replies
5960 Views
Last post January 16, 2023, 1404 UTC
by Pigmeat
14 Replies
597 Views
Last post November 10, 2025, 1343 UTC
by Erdel59
8 Replies
297 Views
Last post November 11, 2025, 0146 UTC
by Héctor
1 Replies
947 Views
Last post August 20, 2023, 0752 UTC
by Ron - Calif.
2 Replies
635 Views
Last post April 25, 2024, 1456 UTC
by myteaquinn
2 Replies
1440 Views
Last post July 07, 2012, 1836 UTC
by ChrisSmolinski
6 Replies
2463 Views
Last post May 26, 2014, 1204 UTC
by ByteBORG
1 Replies
1210 Views
Last post May 20, 2013, 1227 UTC
by ChrisSmolinski
2 Replies
1398 Views
Last post May 20, 2013, 1353 UTC
by ChrisSmolinski
4 Replies
1433 Views
Last post December 24, 2012, 1451 UTC
by curious george

 

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

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns