Xbee S1 indoor range

Hello there....

I am using Xbee S1 as a digital/analog remote sensor.
From Digi's website, the datasheet for XbeeS1 clearly states that it can go upto 30m indoors but I can hardly get 10meters. Outdooe LOS the same story...

Is there any way to use external SMA antenna to boost this or is this all that I have to live with ?

Thanks.

How solid is your supply voltage?
They're power hungry little devils.