XBeePRO comunication fails in stormy days and by night

XBee & XBee Gateway XBee - 802.15.4
1

I have 2 XBEE-PRO Modules separated by almost 100m. They are configured to comunicate in transparent mode. I used TL-ANT2405C omni 5dbi indoor antennas one in each module. I have the following problem, during the day with clear sky both modules comunicates perfect, but in the night and in stormy days the link fails. What could be hapening? I supose that the antennas have low gain and i must use higher gain outdoor omni antennas. Is this correct, can anyone help me?

Thanks a lot.

Eng. Juan Manuel Rosso
DIGIPRINT SRL

2

ohayougozaimasu,

Probably, the output of radio is decreasing it under the influence of rain.

2.4 GHz tends to be absorbed by moisture.

If XBee of other frequency is tried, how is it?