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
6 Replies
26162 Views
Last post April 26, 2025, 0612 UTC
by shadypyro
8 Replies
23533 Views
Last post June 12, 2019, 1216 UTC
by ChrisSmolinski
5 Replies
126 Views
Last post Today at 00:27
by Treehouse SWL
4 Replies
154 Views
Last post October 02, 2025, 0328 UTC
by Treehouse SWL
1 Replies
106 Views
Last post October 01, 2025, 1337 UTC
by ChrisSmolinski
3 Replies
133 Views
Last post October 01, 2025, 0306 UTC
by aurora
3 Replies
222 Views
Last post September 30, 2025, 2346 UTC
by Treehouse SWL
3 Replies
130 Views
Last post September 30, 2025, 1211 UTC
by DXerKen
4 Replies
205 Views
Last post September 29, 2025, 2151 UTC
by aurora
2 Replies
115 Views
Last post September 29, 2025, 1059 UTC
by Ct Yankee
0 Replies
59 Views
Last post September 29, 2025, 0857 UTC
by TRI International
3 Replies
110 Views
Last post September 29, 2025, 0132 UTC
by DXerKen
3 Replies
117 Views
Last post September 29, 2025, 0105 UTC
by Danx73
2 Replies
119 Views
Last post September 28, 2025, 2257 UTC
by aurora
2 Replies
87 Views
Last post September 28, 2025, 0507 UTC
by DXerKen
0 Replies
77 Views
Last post September 27, 2025, 1950 UTC
by ChrisSmolinski
2 Replies
117 Views
Last post September 27, 2025, 1400 UTC
by TRI International
4 Replies
277 Views
Last post September 26, 2025, 1450 UTC
by Danx73
4 Replies
194 Views
Last post September 25, 2025, 2329 UTC
by DXerKen
3 Replies
171 Views
Last post September 25, 2025, 1201 UTC
by Radiouser

 

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