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
1284 Views
Last post February 01, 2020, 1941 UTC
by Ron Hunsicker
4 Replies
889 Views
Last post May 30, 2020, 2120 UTC
by Andrew Yoder
12 Replies
3265 Views
Last post May 14, 2015, 0044 UTC
by ByteBORG
1 Replies
593 Views
Last post December 25, 2022, 2054 UTC
by Shortwave_Listener
7 Replies
5005 Views
Last post June 11, 2025, 0113 UTC
by J. Carlos Pérez Montero
5 Replies
1545 Views
Last post April 10, 2021, 2312 UTC
by Big Badfish Al
4 Replies
1533 Views
Last post February 14, 2016, 1458 UTC
by RainBrandy
1 Replies
651 Views
Last post June 29, 2023, 0047 UTC
by DangerKitty
13 Replies
1629 Views
Last post April 02, 2022, 2335 UTC
by Big Badfish Al
12 Replies
1786 Views
Last post April 15, 2024, 1347 UTC
by Takuji Sahara
2 Replies
1377 Views
Last post March 02, 2013, 2143 UTC
by ChrisSmolinski
2 Replies
786 Views
Last post November 02, 2024, 2116 UTC
by ChrisSmolinski
6 Replies
1747 Views
Last post October 11, 2015, 2155 UTC
by ByteBORG
8 Replies
2549 Views
Last post June 21, 2014, 2059 UTC
by ChrisLobdell
10 Replies
3084 Views
Last post June 06, 2015, 1533 UTC
by ChrisSmolinski
1 Replies
517 Views
Last post December 11, 2022, 1510 UTC
by Bali_Frank
0 Replies
556 Views
Last post February 15, 2024, 0400 UTC
by ChrisLobdell
2 Replies
895 Views
Last post October 14, 2021, 0135 UTC
by Paul Turkk
11 Replies
1284 Views
Last post September 15, 2025, 0310 UTC
by ChrisLobdell
6 Replies
1861 Views
Last post March 06, 2016, 1323 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 T-Shirt
by MitchellTimeDesigns