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
2939 Views
Last post October 29, 2018, 1822 UTC
by Josh
11 Replies
5909 Views
Last post November 29, 2018, 2230 UTC
by R4002
0 Replies
1269 Views
Last post September 10, 2025, 0413 UTC
by Claim Jumper
0 Replies
2271 Views
Last post April 21, 2020, 1040 UTC
by Ct Yankee
0 Replies
2406 Views
Last post March 27, 2018, 1248 UTC
by Daniel Wyllyans
21 Replies
8384 Views
Last post August 10, 2018, 1700 UTC
by R4002
3 Replies
7240 Views
Last post December 26, 2013, 1827 UTC
by Dr. Amp
7 Replies
3886 Views
Last post December 06, 2017, 1921 UTC
by Terry
0 Replies
3087 Views
Last post December 11, 2014, 1021 UTC
by dxextra
0 Replies
3868 Views
Last post December 11, 2014, 1022 UTC
by dxextra
1 Replies
6068 Views
Last post April 22, 2017, 2142 UTC
by Strange Beacons
4 Replies
2839 Views
Last post November 02, 2021, 1803 UTC
by Elf36
162 Mhz NWR distance

Started by Elf36

3 Replies
2591 Views
Last post November 02, 2021, 1408 UTC
by RobRich
Aircraft listening tips

Started by Elf36

3 Replies
2629 Views
Last post November 03, 2021, 1122 UTC
by Elf36
1 Replies
3502 Views
Last post December 18, 2024, 1208 UTC
by R4002
5 Replies
8955 Views
Last post April 21, 2017, 0447 UTC
by R4002
0 Replies
1199 Views
Last post March 24, 2023, 2107 UTC
by FreqFlyer
1 Replies
3272 Views
Last post June 21, 2025, 2016 UTC
by MickeyFinn
2 Replies
1598 Views
Last post February 13, 2023, 1217 UTC
by R4002
0 Replies
1228 Views
Last post February 19, 2023, 1654 UTC
by Harriku

 

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns