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
15 Replies
864 Views
Last post April 14, 2025, 1152 UTC
by Radio Star
9 Replies
480 Views
Last post May 19, 2025, 1618 UTC
by Tony_Pavick
2 Replies
542 Views
Last post April 24, 2025, 1231 UTC
by Andrew Yoder
7 Replies
872 Views
Last post April 26, 2025, 0437 UTC
by shadypyro
10 Replies
1073 Views
Last post April 26, 2025, 0351 UTC
by Radiouser
11 Replies
591 Views
Last post April 27, 2025, 0402 UTC
by newmanm
2 Replies
671 Views
Last post August 31, 2020, 0136 UTC
by Molvania Poacher
2 Replies
747 Views
Last post July 12, 2020, 2302 UTC
by Ray Lalleu
4 Replies
1246 Views
Last post July 12, 2020, 1414 UTC
by Skipmuck
1 Replies
542 Views
Last post March 14, 2021, 1447 UTC
by ChrisSmolinski
1 Replies
1117 Views
Last post January 05, 2014, 1550 UTC
by ChrisSmolinski
3 Replies
1004 Views
Last post April 16, 2021, 2024 UTC
by Ct Yankee
4 Replies
1015 Views
Last post April 10, 2021, 0040 UTC
by ~SIGINT~
10 Replies
1615 Views
Last post September 22, 2020, 0142 UTC
by alleycat
10 Replies
1342 Views
Last post August 07, 2024, 0903 UTC
by N2MLP
14 Replies
1362 Views
Last post March 10, 2023, 2332 UTC
by Sarge94
4 Replies
800 Views
Last post June 25, 2020, 2302 UTC
by Dick Weed
1 Replies
1419 Views
Last post November 26, 2009, 0443 UTC
by LanceLovejoy
2 Replies
767 Views
Last post February 02, 2019, 2040 UTC
by Pigmeat
5 Replies
727 Views
Last post July 14, 2022, 2342 UTC
by Skipmuck

 

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