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
5691 Views
Last post November 25, 2022, 1627 UTC
by Shortwave_Listener
0 Replies
145 Views
Last post July 07, 2025, 1218 UTC
by ChrisSmolinski
1 Replies
249 Views
Last post July 06, 2025, 1310 UTC
by ChrisSmolinski
0 Replies
75 Views
Last post July 06, 2025, 1303 UTC
by ChrisSmolinski
0 Replies
88 Views
Last post July 05, 2025, 0203 UTC
by Big Badfish Al
0 Replies
130 Views
Last post July 03, 2025, 1108 UTC
by ChrisSmolinski
0 Replies
89 Views
Last post July 03, 2025, 1101 UTC
by ChrisSmolinski
0 Replies
140 Views
Last post July 01, 2025, 1650 UTC
by ChrisSmolinski
0 Replies
254 Views
Last post June 23, 2025, 1407 UTC
by Big Badfish Al
4 Replies
1333 Views
Last post June 20, 2025, 0339 UTC
by Pigmeat
0 Replies
345 Views
Last post June 17, 2025, 0625 UTC
by TheHappyWanker
5 Replies
3722 Views
Last post June 16, 2025, 2119 UTC
by TRI International
0 Replies
695 Views
Last post June 15, 2025, 1719 UTC
by ChrisSmolinski
0 Replies
1099 Views
Last post June 15, 2025, 1534 UTC
by ChrisSmolinski
0 Replies
1290 Views
Last post June 11, 2025, 1647 UTC
by ChrisSmolinski
0 Replies
783 Views
Last post June 04, 2025, 1826 UTC
by ChrisSmolinski
0 Replies
829 Views
Last post May 30, 2025, 1305 UTC
by ChrisSmolinski
0 Replies
810 Views
Last post May 24, 2025, 1710 UTC
by ChrisSmolinski
0 Replies
953 Views
Last post May 16, 2025, 1200 UTC
by ChrisSmolinski
2 Replies
1564 Views
Last post May 13, 2025, 1625 UTC
by ChrisSmolinski

 

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