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
320 Views
Last post January 14, 2024, 1005 UTC
by m3ozp1
2 Replies
271 Views
Last post July 19, 2025, 1849 UTC
by Ray Lalleu
1 Replies
398 Views
Last post November 29, 2023, 1537 UTC
by Ray Lalleu
2 Replies
387 Views
Last post January 10, 2024, 1621 UTC
by Ray Lalleu
3 Replies
516 Views
Last post September 11, 2023, 1833 UTC
by Jari Finland
3 Replies
315 Views
Last post August 23, 2025, 2149 UTC
by kris
3 Replies
528 Views
Last post September 22, 2023, 1839 UTC
by kris
0 Replies
224 Views
Last post September 10, 2023, 0653 UTC
by Ray Lalleu
0 Replies
240 Views
Last post August 15, 2023, 1655 UTC
by Ray Lalleu
2 Replies
470 Views
Last post September 12, 2023, 1835 UTC
by Jari Finland
1 Replies
379 Views
Last post October 11, 2023, 1824 UTC
by Ray Lalleu
1 Replies
1517 Views
Last post September 07, 2023, 1855 UTC
by kris
1 Replies
335 Views
Last post March 01, 2025, 1351 UTC
by Alex BLR
1 Replies
319 Views
Last post March 14, 2025, 2053 UTC
by Ronald_Mullis
4 Replies
648 Views
Last post March 14, 2025, 2013 UTC
by Synclair
0 Replies
282 Views
Last post February 28, 2024, 1720 UTC
by Ray Lalleu
1 Replies
375 Views
Last post March 02, 2024, 0836 UTC
by FOX
1 Replies
299 Views
Last post January 29, 2024, 1559 UTC
by Ray Lalleu
2 Replies
607 Views
Last post January 17, 2024, 1549 UTC
by kris
2 Replies
239 Views
Last post October 21, 2023, 1805 UTC
by Ray Lalleu

 

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