What is the maximum distance between two motes who can communicate outside by your chip antenna?

Hi,

Does anyone know the dBi gain of the PCB antenna on the tmote sky modules?? We have layed out a board with fractus 1dBi gain antennas, and we're not getting close to the range of the tmote antennas. Trying to figure out if this is due to lack of gain, or other design/manufacturing issues (unmatched impedance).

Cheers,
Matt
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