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
1 Replies
500 Views
Last post April 11, 2025, 1953 UTC
by JustGreg
3 Replies
1339 Views
Last post January 04, 2016, 1414 UTC
by ChrisSmolinski
8 Replies
4078 Views
Last post September 02, 2017, 0317 UTC
by MrMomB
1 Replies
899 Views
Last post March 16, 2025, 0304 UTC
by Professor
0 Replies
455 Views
Last post June 13, 2025, 1206 UTC
by Tony_Pavick
0 Replies
408 Views
Last post May 25, 2025, 0308 UTC
by DangerKitty
2 Replies
658 Views
Last post March 28, 2025, 0313 UTC
by Sarge94
1 Replies
541 Views
Last post December 06, 2022, 0337 UTC
by Skipmuck
0 Replies
361 Views
Last post December 25, 2024, 0325 UTC
by myteaquinn
5 Replies
831 Views
Last post June 19, 2023, 1359 UTC
by Pigmeat
1 Replies
549 Views
Last post October 08, 2022, 0334 UTC
by TheHappyWanker
3 Replies
246 Views
Last post September 27, 2025, 0349 UTC
by dxace1
0 Replies
789 Views
Last post July 22, 2018, 0408 UTC
by MDK2
1 Replies
545 Views
Last post May 07, 2024, 0431 UTC
by Shortwave_Listener
0 Replies
770 Views
Last post October 24, 2015, 1715 UTC
by ChrisSmolinski
6 Replies
835 Views
Last post August 29, 2025, 2135 UTC
by N2MLP
0 Replies
420 Views
Last post June 30, 2024, 0549 UTC
by Grumpy Grandpa
0 Replies
214 Views
Last post September 26, 2025, 0549 UTC
by Radiouser
1 Replies
529 Views
Last post December 05, 2022, 1044 UTC
by Bali_Frank
3 Replies
983 Views
Last post December 17, 2016, 1502 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