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 permissable in your locale.


No New Posts Shortwave Pirate

Loggings of North American Pirate Stations

Moderators: Beerus Maximus, Zane, Sealord, Kilokat7, Ray Lalleu, DimBulb, jFarley, refmo, clobdell, Skipmuck, pirateswl

150871 Posts
27414 Topics

Last post by Static Addict
in Sounds like SSTV
on Today at 01:31

Child Boards: Broadcast Announcements
No New Posts European Pirates and Private Stations

Loggings of Europirates as well as the licensed low power / hobby European shortwave and mediumwave broadcast stations

Moderators: Beerus Maximus, Ray Lalleu, DimBulb, clobdell, Skipmuck, Shortwave_listener

53625 Posts
27355 Topics

Last post by Ray Lalleu
in UNID bass 6210 AM 2148 ...
on August 11, 2022, 2152 UTC

No New Posts Latin American Pirate

Loggings of pirate radio stations from Central and South America

1673 Posts
852 Topics

Last post by Shortwave_listener
in Radio Compañía Worldwide...
on August 03, 2022, 2305 UTC

No New Posts MW Free Radio

AM/MW Free Radio Station Loggings

1713 Posts
678 Topics

Last post by Shortwave_listener
in Re: UNID 1620 AM 0950 UT...
on July 08, 2022, 2328 UTC

No New Posts FM Free Radio

FM Free Radio Station Loggings

441 Posts
116 Topics

Last post by Dugdiamond
in KLSD 104.7
on April 22, 2022, 2149 UTC

No New Posts HF Beacons

Loggings of the various unlicensed shortwave beacon stations

Moderators: Token, Kilokat7, Teotwaki

8861 Posts
1298 Topics

Last post by Dave Richards
in Re: Gendarme
on August 10, 2022, 1627 UTC

No New Posts Fishing Drift Net Beacons

CW Beacons used to identify and locate drift nets used by fishermen

297 Posts
61 Topics

Last post by Looking-Glass
in DNB logs for August 2022
on August 08, 2022, 0952 UTC

No New Posts 22 Meter Band HiFER Beacons

Loggings of HiFER Part 15 Beacons

Moderator: tesla

969 Posts
288 Topics

Last post by HQ180
in Re: PCO, W8AC, 7P
on August 10, 2022, 2252 UTC

No New Posts Spy Numbers

Loggings of Spy Numbers Stations

Moderator: Token

3922 Posts
1499 Topics

Last post by PXR-5
in 11530 Numbers/Buzzsaw
on August 11, 2022, 1710 UTC

No New Posts Shortwave Broadcast

Loggings of SWBC Stations

Moderators: skeezix, Skipmuck

11277 Posts
6120 Topics

Last post by TRI International
in Voice of Vietnam 11885 ...
on August 11, 2022, 2050 UTC

No New Posts Clandestine Stations

Worldwide Loggings of and information about Clandestine Stations

Moderator: fpeconsultant

1367 Posts
614 Topics

Last post by Ron - Calif.
in Korea
on July 27, 2022, 0429 UTC

No New Posts Longwave Loggings

Loggings of Longwave Stations

Moderators: skeezix, jFarley, Chanter

1660 Posts
318 Topics

Last post by pinto vortando
in Re: LW Longwave beacon K...
on July 26, 2022, 2156 UTC

No New Posts DGPS

DGPS related messages - loggings and software

Moderator: skeezix

4731 Posts
3378 Topics

Last post by skeezix
in DGPS Logs Aug 10 2022 UT...
on August 11, 2022, 1336 UTC

No New Posts MW Loggings

Loggings of MW Stations

Moderators: skeezix, Kilokat7

3150 Posts
1001 Topics

Last post by kris
in Radio Baltic Waves Int. ...
on August 08, 2022, 1738 UTC

No New Posts Utility

Loggings of Utility Stations

Moderator: Beerus Maximus

5025 Posts
1668 Topics

Last post by ~SIGINT~
in HFGCS Force Directional ...
on Today at 00:23

No New Posts WEFAX and SSTV

Loggings of WEFAX and non pirate SSTV transmissions. Images welcome!

Moderator: Skipmuck

358 Posts
130 Topics

Last post by ute_johnny
in ZKLF Wellington, New Zea...
on August 05, 2022, 1341 UTC

No New Posts 10/11 meters

Loggings of licensed and unlicensed stations on 10 and 11 meters

Moderators: thechoat, R4002

2331 Posts
816 Topics

Last post by Pigmeat
in Re: Aussie to US 27.375 ...
on August 10, 2022, 1334 UTC

No New Posts FM DX Loggings

Loggings of FM DX Stations

138 Posts
54 Topics

Last post by East Troy Don
in Re: FM DX from Colorado ...
on June 04, 2022, 1656 UTC

No New Posts TV DX Loggings

Logs of TV DX stations - screencaps welcome

54 Posts
7 Topics

Last post by ThaDood
in Re: Television Repack an...
on August 10, 2020, 0421 UTC

No New Posts VHF/UHF Logs, including satellites and radiosondes

Post anything above 30 MHz, other than Ham, FM and TV, here

1310 Posts
151 Topics

Last post by sat_dxer
in Re: Pirates 250.000-270
on August 03, 2022, 1221 UTC

No New Posts Other

Loggings of Other Stations

3420 Posts
1172 Topics

Last post by ~SIGINT~
in UNID 11171 (centre) 2030...
on July 28, 2022, 2111 UTC

No New Posts Peskies

Fishermen? Drug runners? Or just folks with radios talking in an unlicensed fashion within unconventional bands? The HFU decides

Moderators: R4002, aquabat

1699 Posts
1122 Topics

Last post by ChrisSmolinski
in Re: UNID 8393.3 USB 1028...
on August 08, 2022, 1913 UTC

No New Posts HF Mystery Signals

Unidentified modes - Hearing a digital mode you need help identifying? This is the place

Moderator: Token

1113 Posts
250 Topics

Last post by WPE0ERM
in Re: 7058 +/- kHz WB digi...
on August 05, 2022, 0341 UTC

No New Posts ID and Translation Requests

Got a station you can't ID, or need a translation? Post a link to a recording here

282 Posts
92 Topics

Last post by Th3 Unkn0wn 0ne
in UNID 12583 USB 2258 UTC ...
on August 10, 2022, 0948 UTC

Technical Topics

No New Posts Equipment

Radios and Antenna Discussions

Moderator: corq

6836 Posts
864 Topics

Last post by PXR-5
in Re: Any difference, PL66...
on August 06, 2022, 1351 UTC

No New Posts Part 15 AM and FM Station Operation

Discussions related to legal Part 15 AM and FM station operation

245 Posts
41 Topics

Last post by M R I
in Re: Coax to use
on August 06, 2022, 1625 UTC

No New Posts Propagation

Much like the weather, everybody complains about propagation, but nobody does anything about it.

410 Posts
94 Topics

Last post by ThaDood
in Re: Solar Cycle Sunspot ...
on August 06, 2022, 1758 UTC

No New Posts SDR - Software Defined Radio

Software Defined Radio discussions

1343 Posts
271 Topics

Last post by liduck
in Re: KiwiSDR question DRM...
on July 29, 2022, 2033 UTC

No New Posts The RF Workbench

RF construction projects

Moderator: ff

2333 Posts
243 Topics

Last post by Pigmeat
in Re: Beyond 45/48m
on Today at 02:32

No New Posts Software

Radio Related Software

605 Posts
184 Topics

Last post by JustGreg
in Re: SDR Console ver.3.2 ...
on Today at 00:37

General Category

No New Posts General Radio Discussion

Miscellaneous radio related topics.

16070 Posts
4094 Topics

Last post by Shortwave_listener
in Re: LRA 36 Radio Naciona...
on August 10, 2022, 1643 UTC

No New Posts Amateur Radio

Amateur / Ham Radio related discussions

906 Posts
172 Topics

Last post by TRI International
in 20 Meter contest 14270 ...
on August 11, 2022, 0941 UTC

No New Posts QSLs Received

Post pictures and other details of QSLs and eQSLs here

Moderators: Sealord, pirateswl

10524 Posts
4351 Topics

Last post by Pigmeat
in Re: Cold Beer Radio eQSL...
on August 08, 2022, 1339 UTC

No New Posts Pirate Radio History

A place to post historical articles and QSLs, links to audio files, etc.

Moderator: pirateswl

174 Posts
40 Topics

Last post by ThaDood
in Interview about Brooklyn...
on August 03, 2022, 1939 UTC

No New Posts For Sale / Wanted / Barter

Radio related items for sale, or wanted, or trade/barter - clear out your old junk and get new junk!

377 Posts
111 Topics

Last post by TRI International
in Re: Wanted Heathkit SB-2...
on July 28, 2022, 2046 UTC

No New Posts Huh?

The DX is under g0pher's table

6286 Posts
1272 Topics

Last post by Pigmeat
in Re: Let's get serious fo...
on August 10, 2022, 0012 UTC

No New Posts Group W Bench

Misfit posts

35 Posts
23 Topics

Last post by Kasey⠀Everhart
in Re: Radio Pushka 6920 AM...
on March 04, 2022, 1352 UTC

No New Posts Weather

Everybody complains about the weather, but nobody does anything about it

186 Posts
40 Topics

Last post by Davep
in Re: Water spout warning ...
on August 05, 2022, 1618 UTC

No New Posts Bacon, BBQ, Beef, And More

Tasty LCHF/Paleo/Keto foods for the radio enthusiast

958 Posts
198 Topics

Last post by Erik Mattson
in Re: Jerky Fans? Any Good...
on January 26, 2022, 0131 UTC

  • No New Posts
  • Redirect Board

HFU HF Underground - Info Center

Forum Stats Forum Stats

308780 Posts in 89102 Topics by 5471 Members. Latest Member: Coastal Waves and Wires
Latest Post: "Re: Beyond 45/48m" ( Today at 02:32 )
View the most recent posts on the forum.
[More Stats]

Users Online Users Online

81 Guests, 4 Users

Users active in past 15 minutes:
Hilifer, ~SIGINT~, myteaquinn, Pigmeat

Most Online Today: 100. Most Online Ever: 3935 (April 02, 2020, 1625 UTC)

HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns