XM Satellite Radio XMH10 - Manual (Page 13)

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c. Outdoor installation or indoor wall mounting
The antenna can also be attached vertically to an external or
internal wall if that is more convenient than placing it on a
horizontal surface.
1. Holding your antenna up, find a wall location that ensures a
strong signal. It is recommended that you use an extension
cord to temporarily locate your Xpress XM® antenna
outdoors while optimizing the antenna location with the
Antenna Aiming screen.
2. Attach four screws to the wall using the template provided.
Use screws with head sizes small enough to fit in the center
of each of the four holes but large enough not to pop out of
the elongated sections. Leave 1/8 inch of the screw shanks
behind the heads sticking out of the wall.
3. Tilt the antenna fully back on the base, place the antenna
base on the four screw heads with the antenna pivot at the
top, and pull down approximately 1/4 inch until the base is
firmly secured. Note that the XM® logo will be upside down
when the antenna is properly installed.
4. Tilt the antenna away from the wall/base until the signal
strength is optimized.