I'd just like to point out that SSID broadcasting (or changing its name) has no bearing on security AT ALL! don't worry about it, seriously. If someone wants to know your SSID they will just packet sniff off the wireless, since SSID is sent in plain in every wireless packed anyway there is literally no point trying to hide it lol
I think you are trying this already, but try and get it going without any wep/wpa etc first, you can add security later.
change the channel only if you are clashing with your neighbours, again otherwise there is no point.
I take it that if it came with an external aerial, that you plugged it in? Maybe that model doesn't, I'm not familiar with it.
When you get it working, you'd be better off using wpa if you can.
good luck with it, normally wireless is a piece of cake to get working, maybe you have a duff unit?