I'm not sure how reliable this website is, but according to
http://www.ominous-valve.com/ale-list.txt, this ALE net is believed to be run by FEMA or other elements of the US government. The frequencies ("dial" freq USB mode) are said to be:
4610.0
4979.0
5837.0
7870.0
10424.0
11448.0
11587.5
12109.0
13437.0
16011.0
18475.0
20361.0
23390.0
I left MARS ALE scanning this afternoon and evening, and logged these soundings. To me, it looks like a controlled net where only the NCS sounds.
03FEB2020
[21:13:50][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 27 SN 13
[21:44:00][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 29 SN 12
[21:42:38][FRQ 12109000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 05
[21:48:20][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 29 SN 09
[22:14:17][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 28 SN 12
[22:18:33][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 12
[22:44:33][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 13
[22:48:53][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 29 SN 12
[23:00:39][FRQ 04610000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 10
[23:14:41][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 16
[23:44:57][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 13
04FEB2020
[00:31:20][FRQ 04610000][SND][ ][TWS][6Y8M5 ][AL0] BER 17 SN 13
[00:45:32][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 15
[01:20:03][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 16
[01:31:44][FRQ 04610000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 16
[01:50:13][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 14
[01:52:35][FRQ 04979000][SND][ ][TWS][ZG7D8 ][AL0] BER 30 SN 15
[02:46:20][FRQ 05837000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 08
[02:50:32][FRQ 04979000][SND][ ][TWS][6Y8M5 ][AL0] BER 30 SN 10