From: dcimper@norcom2000.com   
      
   I have been wanting to try some silly experiments using a digital TV   
   dish to make a super-hearing type thing for a while, and finally got   
   ahold of one from someone's trash.   
      
   The one I found has the mounting pole and horn bracket, but the feed   
   horn is missing. Even so just looking at photos of them online, it   
   doesn't appear to me that the horn is at the geometric focal point.   
   Also--even considering it's an offset dish--the dish appears rather   
   shallow and has a round profile, not a parabola at all. Do RF waves   
   behave differently than sound waves in this regard? (Would RF waves have   
   a shorter F-length than simple geometry would indicate?)   
      
   Also just for trivia purposes I am curious as to what the typical dB   
   gain is for this sort of dish (when used for RF), and if that equates at   
   all to sound waves...   
   ~   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)