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
10 Replies
2343 Views
Last post July 23, 2018, 2305 UTC
by ChrisSmolinski
19 Replies
3708 Views
Last post July 07, 2019, 1304 UTC
by ChrisSmolinski
0 Replies
873 Views
Last post October 11, 2018, 0531 UTC
by Mr. Saturn
6 Replies
1648 Views
Last post October 12, 2018, 2015 UTC
by Traveling Wave
4 Replies
1594 Views
Last post September 13, 2018, 1333 UTC
by ChrisSmolinski
18 Replies
2077 Views
Last post July 20, 2024, 0309 UTC
by Jim Renfrew
10 Replies
789 Views
Last post October 31, 2024, 2323 UTC
by KMD3HR
24 Replies
1642 Views
Last post October 29, 2024, 0121 UTC
by Professor
30 Replies
4766 Views
Last post September 22, 2018, 0215 UTC
by [tRMZ]
11 Replies
370 Views
Last post April 07, 2025, 2136 UTC
by Radio Star
1 Replies
549 Views
Last post May 23, 2020, 1843 UTC
by Bali_Frank
7 Replies
1321 Views
Last post April 30, 2019, 2000 UTC
by Traveling Wave
1 Replies
873 Views
Last post September 19, 2018, 1251 UTC
by ChrisSmolinski
3 Replies
1073 Views
Last post September 28, 2018, 1907 UTC
by Josh
27 Replies
2564 Views
Last post August 20, 2022, 0729 UTC
by Ray Lalleu
25 Replies
2996 Views
Last post August 20, 2022, 2142 UTC
by UncleJohn
1 Replies
650 Views
Last post July 25, 2018, 2225 UTC
by ChrisSmolinski
3 Replies
1101 Views
Last post August 10, 2018, 1449 UTC
by ChrisSmolinski
6 Replies
1291 Views
Last post July 26, 2018, 1704 UTC
by ChrisSmolinski
2 Replies
788 Views
Last post June 02, 2019, 1716 UTC
by Big Badfish Al

 

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