yeah, that make's it easier to understand, if i'm 2 hex'es away the target has cover.
Assuming you have LOS , if that line-of-soght crosses a hedge then yes the defender would get cover.
another question come's to mind, are there any restriction's for line of sight when firing past friendly or enemy units.
No. A hex is considered to be rough;y 100 yards, so a dozen soldiers in that space dont reperesnt enough of a presense to block LOS.
is the expert rulebook worth getting or is everything covered in the advanced rulebook,
i have only played a few games of miniatures.
The Expanded Rulebook is OK if you find someone else to use it to, but because its "optional" its not widely accepted IMO.