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
16 Replies
33312 Views
Last post December 31, 2019, 1409 UTC
by R4002
0 Replies
13662 Views
Last post April 15, 2017, 0413 UTC
by R4002
1 Replies
24134 Views
Last post August 23, 2019, 1825 UTC
by R4002
3 Replies
23445 Views
Last post July 25, 2019, 1839 UTC
by R4002
10 Replies
14788 Views
Last post August 13, 2019, 0609 UTC
by BoomboxDX
5 Replies
14443 Views
Last post August 07, 2019, 1758 UTC
by R4002
4 Replies
12775 Views
Last post August 08, 2019, 2221 UTC
by ulx2
25 Replies
11286 Views
Last post March 09, 2020, 1757 UTC
by R4002
16 Replies
9892 Views
Last post April 30, 2017, 1548 UTC
by R4002
7 Replies
7945 Views
Last post July 23, 2017, 0045 UTC
by skeezix
4 Replies
7511 Views
Last post July 11, 2025, 2050 UTC
by NQC
18 Replies
7191 Views
Last post January 08, 2019, 1843 UTC
by ka1iic
13 Replies
7010 Views
Last post April 17, 2017, 1047 UTC
by Looking-Glass
3 Replies
6120 Views
Last post January 02, 2014, 2147 UTC
by jFarley
3 Replies
5606 Views
Last post January 18, 2017, 0450 UTC
by R4002
3 Replies
5604 Views
Last post February 22, 2017, 2329 UTC
by PirateSWL
7 Replies
5473 Views
Last post July 14, 2017, 1848 UTC
by R4002
5 Replies
5405 Views
Last post July 30, 2019, 1823 UTC
by R4002
1 Replies
5401 Views
Last post February 21, 2025, 2235 UTC
by Shortwave_Listener
2 Replies
5022 Views
Last post September 10, 2019, 2206 UTC
by KaySeeks

 

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