[mythtv-users] Best tuner?

[DaveD]

I posted a query a while back asking for advice on which tuner has the 
best sensitivity and got a lot of "get your antenna/signal up", which I 
have been working on, and have made significant progress.  I'm limited 
by trees and covenants that limit my antenna(s) to attic installations, 
but I'm close.  We have reliable recordings MOST of the time, but there 
are still periods of drop-out on certain channels in certain weather 
conditions and I am hoping that my old Dvico Fusion HDTV dual tuner card 
(CX23885 chip) is not up to the task.

One thing I'm considering is that, being a dual card, maybe it's got a 
simple splitter that's cutting down the signal.  I'm wondering if a 
high-sensitivity single tuner unit (card, USB, or network) would be a 
better choice.  I'm getting enough channels, now, that two tuners is not 
enough, anyway, so I thought a distribution amp and another tuner for 
the weaker channels might just get us ready to dump Comcast once and for 
all!

For experimentation, I would like to have a portable (USB) tuner I can 
plug into my laptop.  Any recommendations for a sensitive USB tuner?

All recommendations, ideas and advice are appreciated.

Dave D.