I googled as I suggested and this was hit number 1:
seems like military air to ground coms as gary suggests.
http://www.radiobanter.com/archive/index.php/t-34201.html
there are several URL's to visit and discussion on them on this forum...
73
Colin, V A6BKX
----- Original Message -----
From: "PATRICK GORMLEY" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 11, 2012 2:36 PM
Subject: hf listening
>I just tuned up on 11.175 and heard a lot of noise but no unusual =
> signals.