General Wireless Questions

[Brandon Johnstone]

I recently purchased ADSL wireless.  Modem/router is the Siemens Santis ADSL 50 with a Santis WLAN PC card (802.11b).  My service provider is Skynet via Belgacom in Belgium.  What I would like to know if I purchased a router and PC card that supports 802.11a or g, will the skynet network support this?  The reason I ask is because the signal strength when moving around drops to an unacceptable level. Does the difference in 802.11 standards effect the signal strength?

Thanks
Brandon