Networking

Hi all.
I have a problem with choppy video in my music room (which is around 100 feet away from my house) since a lot of HD videos have been uploaded on YouTube etc.

I have attached a drawing of the set up.

Ordinary vids aren't too bad but with the HD you can just see it struggling frame by frame.

I have an old D-Link DWL 900AP in my loft that has a directional antenna attached to it that is fixed to my chimney.

Obviously the AP is 802.11b which is rather ancient now.
I was thinking of running Cat5 cable all the way to my shed but if a newer 802.11n AP would cure the problem then that would be a tad easier.

I already have a 802.11n adapter in my music room and have a 802.11n broadband router so the AP is the only bottle neck.

Is the distance a problem for the signal from a 802.11n AP?
If not, what would be suitable?

I already bought a second hand router/AP but forgot to check that one of the antennas would unscrew so I could attach my chimney antenna to it, they don't :-o so I don't want to make the same mistake again!

Cheers.

 

Just another thought.
The Router/AP I bought (mentioned below) by mistake is a D-Link DIR-615.
If I could configure this in my loft do you think it would have the range to reach my music room without the need for the antenna on my chimney?