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
4 Replies
909 Views
Last post May 30, 2020, 0108 UTC
by Dr. Strangelove
2 Replies
2062 Views
Last post February 28, 2015, 2009 UTC
by ChrisSmolinski
7 Replies
2310 Views
Last post May 13, 2012, 1407 UTC
by ChrisSmolinski
8 Replies
1775 Views
Last post April 05, 2021, 0300 UTC
by nw7us
0 Replies
1136 Views
Last post June 06, 2010, 2314 UTC
by Evil Elvis
3 Replies
1123 Views
Last post April 08, 2016, 0123 UTC
by ChrisSmolinski
5 Replies
1310 Views
Last post December 03, 2017, 2249 UTC
by Markokpik
1 Replies
635 Views
Last post July 21, 2019, 1141 UTC
by ChrisSmolinski
6 Replies
1133 Views
Last post March 24, 2025, 1127 UTC
by ChrisSmolinski
7 Replies
1847 Views
Last post March 26, 2017, 0043 UTC
by steveyoth
7 Replies
2812 Views
Last post December 26, 2013, 1946 UTC
by Mentholyptus
9 Replies
726 Views
Last post March 20, 2023, 0024 UTC
by ~SIGINT~
7 Replies
1279 Views
Last post October 11, 2020, 2344 UTC
by Radio Star
10 Replies
1310 Views
Last post January 01, 2022, 2329 UTC
by RobRich
8 Replies
1070 Views
Last post January 09, 2022, 0044 UTC
by Andrew Yoder
8 Replies
998 Views
Last post July 26, 2020, 0123 UTC
by Dr. Strangelove
10 Replies
1337 Views
Last post July 06, 2020, 0048 UTC
by blw
0 Replies
449 Views
Last post October 24, 2021, 0033 UTC
by DeathsMage
4 Replies
934 Views
Last post October 23, 2021, 2303 UTC
by raypfaff
4 Replies
811 Views
Last post June 29, 2020, 0109 UTC
by The Web

 

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