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
10 Replies
3203 Views
Last post November 16, 2019, 0024 UTC
by Roykirk
L band antennas

Started by NJQA

10 Replies
6917 Views
Last post April 18, 2020, 1306 UTC
by chanito
Scanner beam

Started by NJQA

10 Replies
9719 Views
Last post January 22, 2025, 0659 UTC
by Robot Matrix
10 Replies
8353 Views
Last post November 10, 2023, 0226 UTC
by BoomboxDX
10 Replies
6505 Views
Last post April 22, 2020, 2054 UTC
by gcopter1
10 Replies
5293 Views
Last post May 19, 2017, 1942 UTC
by Pigmeat
10 Replies
6303 Views
Last post April 30, 2018, 1656 UTC
by Josh
Touching MFJ-956 increases gain.

Started by bandarr3000

10 Replies
4920 Views
Last post April 27, 2018, 1828 UTC
by ka1iic
10 Replies
9578 Views
Last post May 25, 2020, 0523 UTC
by hdofu
10 Replies
5766 Views
Last post April 24, 2014, 1516 UTC
by BoomboxDX
10 Replies
7645 Views
Last post July 25, 2019, 2219 UTC
by i_hear_you
10 Replies
6043 Views
Last post October 23, 2013, 1428 UTC
by K5KNT
10 Replies
11306 Views
Last post July 08, 2016, 1401 UTC
by ka1iic
10 Replies
6628 Views
Last post December 31, 2016, 0455 UTC
by Looking-Glass
Antennas

Started by zackers

10 Replies
7385 Views
Last post April 28, 2013, 0149 UTC
by skeezix
10 Replies
7284 Views
Last post April 27, 2013, 1212 UTC
by Tuco
10 Replies
5789 Views
Last post March 05, 2020, 1940 UTC
by nickcarr3151
10 Replies
5149 Views
Last post June 16, 2022, 2025 UTC
by Mad Radio DXer UK
10 Replies
14231 Views
Last post June 07, 2012, 2033 UTC
by Bowman1
10 Replies
3625 Views
Last post September 22, 2022, 0335 UTC
by Zoidberg

 

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