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
794 Views
Last post April 04, 2015, 1527 UTC
by ChrisSmolinski
3 Replies
958 Views
Last post November 08, 2023, 1548 UTC
by ChrisSmolinski
2 Replies
542 Views
Last post July 17, 2024, 2108 UTC
by N2MLP
0 Replies
671 Views
Last post October 26, 2019, 1459 UTC
by ChrisSmolinski
1 Replies
624 Views
Last post February 02, 2023, 0239 UTC
by Shortwave_Listener
9 Replies
1084 Views
Last post December 05, 2024, 0354 UTC
by dxace1
0 Replies
1261 Views
Last post June 15, 2015, 1353 UTC
by ChrisSmolinski
0 Replies
523 Views
Last post December 22, 2019, 1507 UTC
by ChrisSmolinski
3 Replies
740 Views
Last post September 23, 2022, 1725 UTC
by ChrisSmolinski
2 Replies
546 Views
Last post January 18, 2023, 0304 UTC
by dxbill
0 Replies
353 Views
Last post March 26, 2024, 1431 UTC
by ChrisSmolinski
1 Replies
1127 Views
Last post August 28, 2013, 1212 UTC
by Sealord
1 Replies
1890 Views
Last post March 23, 2015, 1310 UTC
by ChrisSmolinski
5 Replies
1572 Views
Last post April 12, 2025, 0439 UTC
by TheHappyWanker
0 Replies
913 Views
Last post November 10, 2014, 0333 UTC
by Rafman
0 Replies
765 Views
Last post September 01, 2012, 1431 UTC
by ChrisSmolinski
1 Replies
1362 Views
Last post August 22, 2015, 0350 UTC
by blw
0 Replies
727 Views
Last post August 12, 2015, 1556 UTC
by ChrisSmolinski
3 Replies
1700 Views
Last post April 22, 2014, 2139 UTC
by Dick Weed
0 Replies
143 Views
Last post November 02, 2025, 1705 UTC
by Sealord

 

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