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
5 Replies
6588 Views
Last post August 17, 2019, 1622 UTC
by ThElectriCat
16 Replies
6595 Views
Last post January 04, 2022, 2206 UTC
by ~SIGINT~
5 Replies
6616 Views
Last post October 09, 2013, 1446 UTC
by Sealord
3 Replies
6624 Views
Last post June 04, 2013, 0424 UTC
by redhat
Matching Impedance

Started by bandarr3000

14 Replies
6625 Views
Last post January 09, 2018, 2059 UTC
by radiogaga
9 Replies
6626 Views
Last post January 18, 2020, 0856 UTC
by KaySeeks
W6LVP loop feed line

Started by bandarr3000

9 Replies
6630 Views
Last post September 04, 2019, 1945 UTC
by JCMaxwell
0 Replies
6645 Views
Last post February 12, 2012, 1444 UTC
by weaksigs
11 Replies
6698 Views
Last post June 22, 2019, 1928 UTC
by ChrisSmolinski
10 Replies
6706 Views
Last post April 27, 2013, 1212 UTC
by Tuco
4 Replies
6708 Views
Last post August 05, 2017, 1911 UTC
by ChrisSmolinski
4 Replies
6717 Views
Last post March 27, 2025, 1945 UTC
by Synclair
2 Replies
6717 Views
Last post December 30, 2009, 1755 UTC
by spore
18 Replies
6719 Views
Last post November 07, 2018, 1755 UTC
by mysticstar
14 Replies
6736 Views
Last post July 20, 2019, 1554 UTC
by ChrisSmolinski
9 Replies
6781 Views
Last post August 31, 2015, 0218 UTC
by Pigmeat
15 Replies
6797 Views
Last post September 05, 2014, 0616 UTC
by Rafman
12 Replies
6818 Views
Last post September 04, 2013, 0140 UTC
by RCCI
4 Replies
6844 Views
Last post January 06, 2022, 0230 UTC
by RobRich
15 Replies
6890 Views
Last post January 26, 2017, 1741 UTC
by Josh

 

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