[mythtv-users] Has anyone used a "Compro VideoMate USB Digital TV Sticks" (model U3)?

[W.Kenworthy]

Has anyone any experience with a  "Compro VideoMate USB Digital TV
Sticks" (model U3)?  

I am looking at getting a couple but cant find any comments on how
good/suitable they are for MythTV.  Can multiple units be used on one
backend? (I have a machine with no spare PCI slots)  Sensitivity (I cant
see an antenna input on the image) so are they useful or require a high
signal area?  Quality of image?

BillK