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
0 Replies
1295 Views
Last post October 02, 2022, 0401 UTC
by RobRich
2 Replies
1301 Views
Last post November 23, 2023, 2015 UTC
by ThaDood
1 Replies
1305 Views
Last post January 19, 2020, 2022 UTC
by Matt285
0 Replies
1331 Views
Last post February 24, 2022, 2018 UTC
by ThaDood
1 Replies
1332 Views
Last post December 19, 2023, 1859 UTC
by fpeconsultant
6M Band opening

Started by Elf36

1 Replies
1333 Views
Last post June 27, 2022, 1708 UTC
by Polar Bear
1 Replies
1347 Views
Last post February 15, 2020, 1923 UTC
by ThaDood
1 Replies
1360 Views
Last post April 10, 2020, 0711 UTC
by Pigmeat
1 Replies
1364 Views
Last post January 16, 2023, 2118 UTC
by Traveling Wave
1 Replies
1369 Views
Last post November 15, 2019, 2341 UTC
by Pigmeat
2 Replies
1376 Views
Last post January 23, 2023, 1935 UTC
by ThaDood
1 Replies
1378 Views
Last post November 07, 2022, 1728 UTC
by Grinch
3B9FR (Rodrigues Island) CW

Started by Elf36

0 Replies
1381 Views
Last post December 23, 2021, 1650 UTC
by Elf36
RK7F (Russia)

Started by Elf36

0 Replies
1383 Views
Last post December 24, 2021, 1303 UTC
by Elf36
1 Replies
1385 Views
Last post July 12, 2022, 0126 UTC
by BoomboxDX
3 Replies
1392 Views
Last post June 20, 2025, 2013 UTC
by RM2 Squid
1 Replies
1395 Views
Last post February 28, 2023, 1425 UTC
by Pigmeat
1 Replies
1395 Views
Last post March 27, 2024, 2148 UTC
by osiris
1 Replies
1407 Views
Last post July 07, 2022, 1852 UTC
by Polar Bear
0 Replies
1445 Views
Last post May 30, 2025, 1359 UTC
by ThaDood

 

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