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
2 Replies
18105 Views
Last post July 04, 2020, 1932 UTC
by MojaveBeaconeer
0 Replies
3543 Views
Last post December 05, 2025, 1412 UTC
by hammarhead
1 Replies
392 Views
Last post December 04, 2025, 1520 UTC
by Zenith.swl
1 Replies
361 Views
Last post December 04, 2025, 1513 UTC
by Zenith.swl
2 Replies
1375 Views
Last post November 23, 2025, 2056 UTC
by tennessee
PCO

Started by HQ180

0 Replies
1518 Views
Last post October 26, 2025, 2043 UTC
by HQ180
1 Replies
5039 Views
Last post September 24, 2025, 0835 UTC
by Prairiedog
0 Replies
977 Views
Last post September 22, 2025, 1621 UTC
by circuitmike
0 Replies
706 Views
Last post September 22, 2025, 1558 UTC
by circuitmike
0 Replies
808 Views
Last post September 21, 2025, 1458 UTC
by circuitmike
0 Replies
668 Views
Last post September 21, 2025, 1444 UTC
by circuitmike
0 Replies
687 Views
Last post September 21, 2025, 1422 UTC
by circuitmike
QIW On Air Today

Started by N9QIW

0 Replies
5725 Views
Last post July 27, 2025, 1717 UTC
by N9QIW
4XZ 13514 Khz

Started by ve6pg

1 Replies
5314 Views
Last post May 02, 2025, 0209 UTC
by Charlie_Dont_Surf
0 Replies
2312 Views
Last post May 01, 2025, 0158 UTC
by ve6pg
2 Replies
3782 Views
Last post April 26, 2025, 0223 UTC
by ve6pg
5 Replies
10234 Views
Last post April 10, 2025, 0050 UTC
by Indy SWL
1 Replies
10290 Views
Last post February 25, 2025, 0427 UTC
by Robot Matrix
3 Replies
9176 Views
Last post February 16, 2025, 2259 UTC
by Traveling Wave
1 Replies
6794 Views
Last post February 07, 2025, 1258 UTC
by KI5UCO

 

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