is it at all possible to use another base station to extend the range of my airport by adding another basestation w/o connecting them via ethernet
I think you just need to find a repeater.
I don't think it needs to be an airport, but a repeater would do what you are trying to accomplish.
i already have a second airport(both graphite) i bought it thinking that there was a way to do this without either being the extreams. if there isnt a way to do this then the peoson who bought it will be verry upset