that linear lnb isn't picking up dtv.
you should be able to see fade marks on the lnb to let you know the focal point. and yes you need to skew the lnb itself. check dishpointer.com for your settings, don't forget to enter your location. what receiver are you using? and is your signal metre unhooked when your seing the 50% signal?
if your using this for shaw I'd suggest it's time to upgrade your dish...lol
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