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
4334 Views
Last post August 24, 2015, 0402 UTC
by Fansome
0 Replies
4328 Views
Last post January 22, 2014, 0019 UTC
by CoolAM Radio
RF Components

Started by Oliver

3 Replies
4322 Views
Last post March 27, 2015, 1831 UTC
by redhat
2 Replies
4306 Views
Last post January 07, 2011, 2011 UTC
by ETM71
5 Replies
4301 Views
Last post May 07, 2023, 1304 UTC
by alpard
2 Replies
4268 Views
Last post May 02, 2017, 1710 UTC
by RST111
7 Replies
4262 Views
Last post September 11, 2016, 1401 UTC
by DimBulb
15 Replies
4247 Views
Last post February 10, 2021, 0506 UTC
by Under30
2 Replies
4220 Views
Last post August 04, 2015, 1335 UTC
by radiogaga
7 Replies
4217 Views
Last post October 13, 2014, 2059 UTC
by The Insomniac
Copper Clad Steel

Started by NJQA

11 Replies
4208 Views
Last post April 30, 2020, 1256 UTC
by NJQA
4 Replies
4187 Views
Last post March 19, 2012, 2222 UTC
by ff
6 Replies
4185 Views
Last post February 18, 2016, 0332 UTC
by VK3BVW
4 Replies
4168 Views
Last post December 12, 2011, 0337 UTC
by Zoidberg
4 Replies
4168 Views
Last post October 11, 2019, 2232 UTC
by Josh
3 Replies
4167 Views
Last post October 23, 2012, 0302 UTC
by thechoat
10 Replies
4162 Views
Last post June 16, 2022, 2025 UTC
by Mad Radio DXer UK
Kiwi SDR

Started by NJQA

6 Replies
4137 Views
Last post September 09, 2019, 2043 UTC
by Josh
0 Replies
4112 Views
Last post December 05, 2013, 0046 UTC
by CoolAM Radio
4 Replies
4090 Views
Last post July 26, 2015, 0617 UTC
by BoomboxDX

 

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