La Crosse Technology WS-9121 - Manual (Page 29)

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915 MHz RECEPTION CHECK
The Temperature Station should receive the outdoor temperature data
within a few minutes after setup. If the temperature data are not received
about 2 minutes after setup (the signal reception icon does not appear),
please check the following points:
1.
The distance of the Temperature Station or transmitter should be
at least 1.5 to 2 meters away from any interfering sources such as
computer monitors or TV sets.
2. Avoid positioning the Temperature Station onto or in the immediate
proximity of metal window frames.