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
717 Views
Last post April 04, 2022, 2153 UTC
by ~SIGINT~
3 Replies
1463 Views
Last post November 25, 2018, 1922 UTC
by Sealord
0 Replies
143 Views
Last post September 10, 2025, 1034 UTC
by ChrisSmolinski
3 Replies
1252 Views
Last post March 30, 2013, 1810 UTC
by jFarley
7 Replies
1467 Views
Last post February 04, 2018, 1751 UTC
by slowtrain
1 Replies
1037 Views
Last post November 12, 2014, 2102 UTC
by jFarley
8 Replies
1712 Views
Last post November 29, 2024, 2224 UTC
by JustGreg
0 Replies
957 Views
Last post June 12, 2014, 1809 UTC
by ChrisSmolinski
8 Replies
1744 Views
Last post February 13, 2017, 0002 UTC
by myteaquinn
4 Replies
1611 Views
Last post May 13, 2019, 2340 UTC
by dandan22
4 Replies
817 Views
Last post December 12, 2021, 1514 UTC
by Radio Star
11 Replies
2839 Views
Last post May 30, 2015, 0004 UTC
by Gino Italy
1 Replies
508 Views
Last post September 04, 2024, 1944 UTC
by caodwolf
1 Replies
1433 Views
Last post November 21, 2009, 2302 UTC
by Sealord
5 Replies
1519 Views
Last post March 30, 2025, 1748 UTC
by N2MLP
1 Replies
905 Views
Last post July 29, 2012, 1444 UTC
by jFarley
9 Replies
6644 Views
Last post January 25, 2014, 2303 UTC
by LighthouseOhio
5 Replies
1169 Views
Last post December 30, 2018, 2102 UTC
by Radio Star
0 Replies
890 Views
Last post March 25, 2012, 1423 UTC
by ChrisSmolinski
10 Replies
2094 Views
Last post March 26, 2017, 2154 UTC
by JoeFLIPS

 

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