PlotBand Annotations
Plot Band Annotation is a stripe, crossing its corresponding axis, specified by the From and To properties.
Cartesian PlotBand Annotation
Cartesian PlotBand annotation is either a horizontal or a vertical stripe that crosses from start to end the vertical or the horizontal axis respectively.
Here is what CartesianPlotBandAnnotation looks like:
<telerik:CartesianPlotBandAnnotation From="4.3" To="5.5" Axis="{Binding ElementName=verticalAxis}"/>
<telerik:CartesianPlotBandAnnotation From="0.5" To="1.5" Axis="{Binding ElementName=horizontalAxis}"/>

Polar Axis PlotBand Annotation
The Polar axis PlotBand annotation resembles a donut.
Here is what PolarAxisPlotBandAnnotation looks like:
<telerik:PolarAxisPlotBandAnnotation From="6" To="9"/>

Radial Axis PlotBand Annotation
Radial Axis PlotBand annotations represent visually a sector of the circle (pie slice).
A plotband starting from 180 degrees and ending in 270 degrees will look like this:
<telerik:RadialAxisPlotBandAnnotation From="270" To="180" />

If you wonder how to annotate the bigger segment from the image above, then you should switch the From and To values.
<telerik:RadialAxisPlotBandAnnotation From="270" To="180" />

Properties
Common:
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Fill
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DashArray
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Stroke
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StrokeThickness
Cartesian:
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Axis The Cartesian PlotBand annotation needs to be associated with horizontal or vertical axis explicitly.
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From (of type object) The starting point for the plot band. When the associated axis is numerical (Linear or Logarithmic) a numeric value is expected and when it is a CategoricalAxis - a category.
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To (of type object) The ending point for the plot band.*When the associated axis is numerical (Linear or Logarithmic) a numeric value is expected and when it is a CategoricalAxis - a category.
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Label The string, defining the label.
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LabelDefinition Defines the position of the annotation label, check the Annotation Labels help topic for more details.
Polar:
- From (of type double) The starting point for the plot band. To (of type double) The ending point for the plot band.
Radial:
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From (of type object) The starting point for the plot band. When the radial axis is NumericRadialAxis a numeric value is expected and when it is a CategoricalRadialAxis - a category.
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To (of type object) The ending point for the plot band. When the radial axis is NumericRadialAxis a numeric value is expected and when it is a CategoricalRadialAxis - a category.