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
6 Replies
5719 Views
Last post September 06, 2023, 0228 UTC
by Jon Shoe - N8UL
15 Replies
1321 Views
Last post July 19, 2025, 0233 UTC
by Professor
16 Replies
2248 Views
Last post January 01, 2024, 2344 UTC
by RobRich
8 Replies
595 Views
Last post April 27, 2025, 0121 UTC
by Quasar
22 Replies
2451 Views
Last post December 04, 2022, 0020 UTC
by R. Comeau
20 Replies
2648 Views
Last post September 17, 2023, 0115 UTC
by ~SIGINT~
11 Replies
1092 Views
Last post December 08, 2022, 1235 UTC
by ChrisSmolinski
10 Replies
2818 Views
Last post February 01, 2025, 2338 UTC
by Crater Eddie
8 Replies
1126 Views
Last post February 17, 2024, 0118 UTC
by Markokpik
0 Replies
393 Views
Last post November 08, 2024, 2331 UTC
by DangerKitty
2 Replies
579 Views
Last post May 29, 2025, 0214 UTC
by Quasar
21 Replies
2357 Views
Last post December 16, 2023, 1542 UTC
by Sealord
12 Replies
544 Views
Last post October 05, 2025, 1212 UTC
by ChrisSmolinski
7 Replies
792 Views
Last post February 04, 2023, 1933 UTC
by Shortwave_Listener
17 Replies
1748 Views
Last post April 05, 2025, 0042 UTC
by Paul65
15 Replies
2235 Views
Last post September 23, 2023, 0042 UTC
by sman63
12 Replies
1025 Views
Last post May 04, 2025, 0052 UTC
by Andrew Yoder
0 Replies
447 Views
Last post October 29, 2023, 0100 UTC
by DangerKitty
6 Replies
4091 Views
Last post June 01, 2025, 1514 UTC
by ChrisSmolinski
2 Replies
384 Views
Last post March 07, 2025, 2259 UTC
by Radiouser

 

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