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
0 Replies
649 Views
Last post January 16, 2023, 2354 UTC
by Shortwave_Listener
0 Replies
741 Views
Last post October 20, 2024, 1932 UTC
by Shortwave_Listener
1 Replies
770 Views
Last post March 15, 2023, 1202 UTC
by ChrisSmolinski
0 Replies
747 Views
Last post June 04, 2022, 1531 UTC
by Shortwave_Listener
0 Replies
1007 Views
Last post October 24, 2023, 0030 UTC
by Shortwave_Listener
0 Replies
717 Views
Last post September 30, 2022, 1544 UTC
by Shortwave_Listener
1 Replies
918 Views
Last post October 22, 2024, 0151 UTC
by n2avh
0 Replies
695 Views
Last post June 03, 2023, 0138 UTC
by Shortwave_Listener
0 Replies
881 Views
Last post June 05, 2022, 1454 UTC
by Shortwave_Listener
0 Replies
649 Views
Last post September 30, 2022, 1952 UTC
by Shortwave_Listener
0 Replies
653 Views
Last post October 30, 2022, 0305 UTC
by Shortwave_Listener
0 Replies
776 Views
Last post October 20, 2024, 1940 UTC
by Shortwave_Listener
0 Replies
1691 Views
Last post January 11, 2025, 2005 UTC
by Shortwave_Listener
0 Replies
710 Views
Last post June 06, 2023, 0225 UTC
by Shortwave_Listener
0 Replies
759 Views
Last post July 04, 2022, 1639 UTC
by Shortwave_Listener
1 Replies
706 Views
Last post October 02, 2022, 2115 UTC
by Shortwave_Listener
0 Replies
673 Views
Last post November 03, 2022, 2302 UTC
by Shortwave_Listener
0 Replies
791 Views
Last post October 25, 2024, 0212 UTC
by Shortwave_Listener
1 Replies
2328 Views
Last post January 11, 2025, 2359 UTC
by hflstnr
1 Replies
278 Views
Last post September 14, 2025, 0042 UTC
by n2avh

 

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