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
Isolator Frequency Range

Started by bandarr3000

3 Replies
2748 Views
Last post August 20, 2019, 1714 UTC
by Josh
13 Replies
4972 Views
Last post November 16, 2017, 1727 UTC
by Finman
Well as Ground

Started by bandarr3000

6 Replies
3510 Views
Last post October 24, 2017, 1705 UTC
by pinto vortando
Loop on Ground - Can I bury the loop?

Started by bandarr3000

13 Replies
5174 Views
Last post March 07, 2019, 2200 UTC
by paranoid dxer
6 Replies
35604 Views
Last post October 25, 2017, 0855 UTC
by pinto vortando
Ridiculously High SWR for G5RV Jr.

Started by bandarr3000

13 Replies
8271 Views
Last post December 11, 2018, 0548 UTC
by n3ckf
3 Replies
4474 Views
Last post August 30, 2019, 1142 UTC
by Pigmeat
Electronic Dog Fence Wire as Antenna

Started by bandarr3000

9 Replies
6969 Views
Last post April 22, 2018, 1642 UTC
by Josh
elevated vertical antenna -- radials?

Started by bandarr3000

3 Replies
1933 Views
Last post April 14, 2018, 0712 UTC
by Stretchyman
15 Replies
4356 Views
Last post April 23, 2018, 2130 UTC
by Pigmeat
Touching MFJ-956 increases gain.

Started by bandarr3000

10 Replies
3319 Views
Last post April 27, 2018, 1828 UTC
by ka1iic
High inverted V or low loop for SWL

Started by bandarr3000

13 Replies
4227 Views
Last post October 30, 2018, 1949 UTC
by Josh
Matching Impedance

Started by bandarr3000

14 Replies
5596 Views
Last post January 09, 2018, 2059 UTC
by radiogaga
Telescoping Antenna Mast

Started by bandarr3000

2 Replies
2443 Views
Last post April 26, 2018, 0122 UTC
by bandarr3000
5 Replies
2339 Views
Last post January 12, 2018, 1315 UTC
by pinto vortando
6 Replies
13412 Views
Last post June 07, 2014, 1709 UTC
by Antennae
11 Replies
5956 Views
Last post April 04, 2017, 2246 UTC
by Looking-Glass
Noise level

Started by BDM

4 Replies
4225 Views
Last post October 28, 2012, 0922 UTC
by Northwest Radio
6 Replies
2285 Views
Last post February 09, 2020, 0638 UTC
by ThElectriCat
11 Replies
10041 Views
Last post October 08, 2013, 1914 UTC
by rdla4

 

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