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
336 Views
Last post July 16, 2025, 1804 UTC
by ukdxer
0 Replies
484 Views
Last post March 19, 2021, 2345 UTC
by kris
0 Replies
517 Views
Last post November 25, 2021, 2256 UTC
by kris
2 Replies
343 Views
Last post April 02, 2023, 1703 UTC
by Ray Lalleu
3 Replies
546 Views
Last post August 01, 2023, 2201 UTC
by N2MLP
1 Replies
350 Views
Last post November 26, 2022, 1018 UTC
by Ray Lalleu
3 Replies
691 Views
Last post November 12, 2021, 1702 UTC
by Bali_Frank
3 Replies
633 Views
Last post April 01, 2021, 1957 UTC
by Bali_Frank
0 Replies
290 Views
Last post June 25, 2023, 1230 UTC
by kris
1 Replies
330 Views
Last post February 26, 2024, 1922 UTC
by Ray Lalleu
0 Replies
1188 Views
Last post January 27, 2018, 1515 UTC
by kris
2 Replies
586 Views
Last post August 30, 2021, 1819 UTC
by Ray Lalleu
0 Replies
464 Views
Last post December 09, 2021, 0021 UTC
by kris
2 Replies
628 Views
Last post February 05, 2021, 2137 UTC
by Ray Lalleu
3 Replies
211 Views
Last post November 19, 2025, 1659 UTC
by Ray Lalleu
0 Replies
295 Views
Last post April 15, 2023, 1635 UTC
by kris
2 Replies
619 Views
Last post October 05, 2019, 1921 UTC
by ukdxer
3 Replies
1159 Views
Last post June 22, 2018, 2256 UTC
by Brian
0 Replies
390 Views
Last post December 16, 2024, 0103 UTC
by kris
0 Replies
266 Views
Last post May 18, 2023, 2028 UTC
by kris

 

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