XM Satellite Radio XMH10 - Manual (Page 11)

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has two different signal-strength indicators which will help you
optimize the antenna’s position: The first is a basic signal strength
indicator visible at the upper right corner of the display screen during
normal listening. It has from zero to four vertical bars; four bars
represent the strongest signal. The other is a higher-resolution
signal-strength indicator screen which allows you to optimally aim
your XM® Antenna. This screen shows Terrestrial and Satellite
indications in a horizontal bar graph presentation, with a minus (-)
sign on the left and a plus (+) sign on the right.
To access and use this screen, refer to the Xpress XM Satellite
Radio Receiver User Guide (128-7454B). Adjust the antenna location
until the maximum number of “Satellite” bars is displayed. The Xpress
XM® will receive programming as long as either the satellite or
terrestrial signal has at least two bars displayed.
Selecting a position with the maximum number of “Satellite” bars
displayed will ensure a consistently strong signal.