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
608 Views
Last post December 15, 2022, 2156 UTC
by Token
1 Replies
677 Views
Last post December 15, 2022, 2157 UTC
by Token
0 Replies
810 Views
Last post December 19, 2022, 0038 UTC
by ~SIGINT~
3 Replies
889 Views
Last post December 30, 2022, 0536 UTC
by ~SIGINT~
2 Replies
858 Views
Last post December 30, 2022, 2148 UTC
by ButchKidd
2 Replies
896 Views
Last post January 11, 2023, 2007 UTC
by Josh
4 Replies
1056 Views
Last post January 17, 2023, 1541 UTC
by Pigmeat
5 Replies
1772 Views
Last post January 17, 2023, 1558 UTC
by Pigmeat
5 Replies
1586 Views
Last post January 18, 2023, 1845 UTC
by minorukun
3 Replies
1248 Views
Last post January 28, 2023, 0234 UTC
by Charlie_Dont_Surf
7 Replies
2215 Views
Last post March 03, 2023, 1959 UTC
by Monophonia
0 Replies
665 Views
Last post April 10, 2023, 1902 UTC
by Token
0 Replies
739 Views
Last post April 10, 2023, 1903 UTC
by Token
1 Replies
1278 Views
Last post April 15, 2023, 0812 UTC
by l0ngwire
2 Replies
1004 Views
Last post May 30, 2023, 1540 UTC
by ~SIGINT~
1 Replies
1354 Views
Last post June 12, 2023, 1249 UTC
by Pigmeat
Two Tone Beeps

Started by swl22

0 Replies
929 Views
Last post July 01, 2023, 2201 UTC
by swl22
8 Replies
1140 Views
Last post July 19, 2023, 1847 UTC
by ~SIGINT~
2 Replies
951 Views
Last post July 29, 2023, 0156 UTC
by ~SIGINT~
0 Replies
538 Views
Last post September 21, 2023, 1425 UTC
by Token

 

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