La Crosse Technology WS-9125 - Manual (Page 32)

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Note:
The mounting surface can affect the transmission range. If, for instance,
the unit is attached to a piece of metal, it may then either reduce or
increase the transmitting range. For this reason, we recommend not to
place the unit on any metal surfaces or in any position where a large
metal or highly polished surface is in the immediate vicinity (garage
doors, double glazing, etc.). Before securing in place, please ensure that
the Temperature Station can receive the 915MHz signal from the
temperature sensor at the positions that you wish to place them.