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
CIS Navy on HF

Started by Josh « 1 2 3 4 5 6 7 8 9 10 »

146 Replies
61692 Views
Last post March 31, 2023, 2203 UTC
by Josh
Abner's Mega Thread

Started by AbnersFarm « 1 2 3 4 5 6 7 8 9 ... 15 »

218 Replies
67428 Views
Last post July 15, 2014, 0634 UTC
by AbnersFarm
11175 USB

Started by Josh « 1 2 3 4 5 6 7 8 9 ... 12 »

172 Replies
82672 Views
Last post May 26, 2021, 0557 UTC
by Josh
97 Replies
110114 Views
Last post October 08, 2025, 2058 UTC
by Looking-Glass
Logs (by tiNG)

Started by tiNG « 1 2 3 4 5 6 7 8 9 »

120 Replies
112114 Views
Last post October 19, 2025, 1608 UTC
by tiNG

 

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