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
1 Replies
529 Views
Last post October 13, 2022, 0321 UTC
by Kenotic
0 Replies
926 Views
Last post November 13, 2018, 0010 UTC
by flexoman61
0 Replies
361 Views
Last post October 27, 2023, 0753 UTC
by TRI International
1 Replies
828 Views
Last post June 18, 2019, 0242 UTC
by MDK2
8 Replies
2564 Views
Last post October 04, 2017, 0215 UTC
by Davep
2 Replies
1787 Views
Last post April 18, 2017, 0117 UTC
by flexoman61
0 Replies
535 Views
Last post June 15, 2021, 0218 UTC
by Ct Yankee
0 Replies
975 Views
Last post August 22, 2019, 0227 UTC
by WWBR
3 Replies
712 Views
Last post August 24, 2022, 0151 UTC
by Pigmeat
0 Replies
102 Views
Last post August 17, 2025, 0931 UTC
by Ct Yankee
0 Replies
381 Views
Last post November 24, 2022, 1006 UTC
by Ct Yankee
2 Replies
675 Views
Last post March 20, 2024, 1623 UTC
by Paul B. Walker, Jr.
0 Replies
449 Views
Last post September 23, 2024, 0335 UTC
by Weatherman
4 Replies
2139 Views
Last post September 09, 2017, 0109 UTC
by MDK2
2 Replies
634 Views
Last post August 20, 2025, 0256 UTC
by East Troy Don
0 Replies
847 Views
Last post February 24, 2018, 0612 UTC
by Davep
0 Replies
332 Views
Last post December 09, 2023, 2259 UTC
by Paul65
0 Replies
771 Views
Last post March 13, 2017, 0147 UTC
by MDK2
3 Replies
2136 Views
Last post July 23, 2015, 0128 UTC
by Pigmeat
0 Replies
1019 Views
Last post March 28, 2016, 0115 UTC
by flexoman61

 

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground Garden Flag
by MitchellTimeDesigns