i don't use adhoc
(as i already told you
), it's infrastructure mode witrh a wireless router.
the range depends on many many things. one of the factors is obviously your card's sensitivity, this can be improved by attaching an external aerial, or by using something else for an external aerial
(doesn't need to be attached
) - you can look for it on the net how to do it.
the range also depends on how good the AP is, or if it is adhoc mode with a PC with a simple wireless card, it will be much worse than with a real AP. that's one of the reasons i'm using an AP in infrastructure mode.
there are still other factors, for example if you're in the open and your card can directly see the AP or if you have walls between and what material the walls are made of.
as for my experiences.. i can get good signals in the whole house
(and it's big
) except one room where the wall contains too many metals.. i get a good signal outside, in the garden too, but one of our fences won't let them through.
my wifi card is a senao compact flash card
(router is just an average 11 mbps wireless router
) and it's absolutely fine, as good as some pcmcia cards. though i'm sure it's worse than the best ones..