Question : Problem: I want to extend my Apple TV to seperate speakers outside

This is my current setup

PC is located upstairs with iTunes installed.
That wirelessly connects to the Apple TV downstairs via a 22inch display, amd and speakers.
Ine the outdoor shed, which is within range of the wireless network, I want to be able to connect something to the speakers that will allow me to have the same music playing outside as indside. I thought perhaps an Airport Express, but the guy at the Apple store says no.

Any Ideas ??

Answer : Problem: I want to extend my Apple TV to seperate speakers outside

You might need to split the audio from the apple tv audio output, then use a wireless audio transmitter to send the signal to the shed.  You can then use an amp/receiver to power your outside speakers.