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
12 Replies
2173 Views
Last post July 12, 2020, 1044 UTC
by Skipmuck
12 Replies
1087 Views
Last post July 12, 2025, 0210 UTC
by Andrew Yoder
12 Replies
3148 Views
Last post June 15, 2025, 1404 UTC
by CaptainMitchell
12 Replies
2139 Views
Last post August 30, 2020, 0110 UTC
by Markokpik
12 Replies
1450 Views
Last post August 29, 2020, 0051 UTC
by KMD3HR
12 Replies
1397 Views
Last post February 08, 2023, 2350 UTC
by Shortwave_Listener
12 Replies
3333 Views
Last post April 21, 2019, 0126 UTC
by MrMomB
12 Replies
1261 Views
Last post February 04, 2023, 1644 UTC
by Shortwave_Listener
12 Replies
2576 Views
Last post August 29, 2020, 0213 UTC
by shadypyro
12 Replies
722 Views
Last post July 05, 2025, 0107 UTC
by DXerKen
12 Replies
3336 Views
Last post May 24, 2015, 1545 UTC
by ChrisSmolinski
12 Replies
3564 Views
Last post February 26, 2012, 0128 UTC
by myteaquinn
12 Replies
2866 Views
Last post July 26, 2013, 0221 UTC
by Sealord
12 Replies
2725 Views
Last post January 23, 2016, 1438 UTC
by Tuco
12 Replies
1685 Views
Last post February 26, 2022, 2025 UTC
by UncleJohn
12 Replies
1866 Views
Last post February 29, 2024, 0155 UTC
by ~SIGINT~
12 Replies
2941 Views
Last post May 05, 2014, 1854 UTC
by metricoclock
12 Replies
2949 Views
Last post June 14, 2025, 0232 UTC
by Professor
12 Replies
6013 Views
Last post May 20, 2015, 1943 UTC
by ChrisSmolinski
12 Replies
1482 Views
Last post February 24, 2024, 1329 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 T-Shirt
by MitchellTimeDesigns