[mythtvnz] Setting up for freeview - idiot's guide please

[Craig Box]

> You'll either need a dual LNB (not two LNBs), like this one;
> http://www.freeviewshop.co.nz/acer-dual-output-ku-band-lnb-p-368.html

There's no price listed, does anyone have a rough idea of their value to
save everyone asking individually?

Can I tell Sky there's "something wrong" and have them come install a new
one?

Is there a way I can climb on my roof and tell if my LNB is dual polarity?

Craig