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
12 Replies
1501 Views
Last post February 14, 2022, 0113 UTC
by Dr. Strangelove
12 Replies
3116 Views
Last post May 18, 2015, 1156 UTC
by ChrisSmolinski
12 Replies
1454 Views
Last post January 29, 2023, 0257 UTC
by Pigmeat
12 Replies
1787 Views
Last post February 19, 2022, 2357 UTC
by William Hassig
12 Replies
3707 Views
Last post February 26, 2012, 0128 UTC
by myteaquinn
12 Replies
1350 Views
Last post February 04, 2023, 1644 UTC
by Shortwave_Listener
12 Replies
1649 Views
Last post February 04, 2023, 0355 UTC
by Pigmeat
12 Replies
2743 Views
Last post June 15, 2025, 0205 UTC
by TheHappyWanker
12 Replies
1875 Views
Last post February 17, 2024, 0223 UTC
by canswl
12 Replies
1608 Views
Last post February 26, 2022, 0315 UTC
by Sky Waves
12 Replies
2569 Views
Last post May 07, 2014, 0213 UTC
by Edward Insinger
12 Replies
3517 Views
Last post May 24, 2015, 1545 UTC
by ChrisSmolinski
12 Replies
1719 Views
Last post February 05, 2023, 0008 UTC
by Davep
12 Replies
3416 Views
Last post July 27, 2013, 1558 UTC
by jFarley
12 Replies
1505 Views
Last post June 22, 2025, 0049 UTC
by hflstnr
12 Replies
1499 Views
Last post February 05, 2023, 2341 UTC
by Shortwave_Listener
12 Replies
3180 Views
Last post June 27, 2020, 0215 UTC
by MrMomB
12 Replies
1400 Views
Last post January 14, 2023, 2226 UTC
by William Hassig
12 Replies
1589 Views
Last post September 30, 2023, 1254 UTC
by ChrisSmolinski
12 Replies
2271 Views
Last post November 19, 2021, 0242 UTC
by ✠ Blue Max

 

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