HP Pavilion 8290 User Manual page 79

Lightning Protection
For added protection of any Hewlett-Packard product during
a lightning storm, or when it is left unattended and unused
for long periods of time, unplug the product from the wall
outlet and disconnect the antenna or cable system. This will
prevent damage to the product due to lightning and power
line surges.
Power Lines
An outside antenna system should not be located in the
vicinity of overhead power lines or other electric light or
power circuits, or where it can fall into such power lines or
circuits.
Warning: When installing an outside antenna system,
extreme care should be taken to keep from touching such
power lines or circuits as contact with them could be fatal.
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Chapter 6 Upgrading and Servicing Your Computer