TS Sub Tactics Revealed (?)

Strategy Page has a short article up on modern submarine intelligence gathering that is provided without comment. Excerpt:

..."The latest revelation is that SSNs accompanying carrier task forces are using special antennas (design details are definitely not discussed) that allow the subs to collect electronic traffic in areas carrier task forces have just left. This is useful because it's become common for hostile nations (North Korea, China, Iran, France, Etc.) to shut down a lot of wireless communications and radars when an American carrier task force is in the area. This is because it is common knowledge that intelligence specialists on these ships monitor the local electronic traffic and collect useful information. To get around this, the SSN accompanying the task force will linger after the carrier leaves, and wait until the locals turn their electronic gear back on..."

Going deep...