Are the radar images within ForeFlight Mobile base or composite reflectivity?

When connected to the internet, you will have the options to choose either Composite or Lowest Tilt radar.

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Image 1. Internet radar options are Composite and Lowest Tilt.

When connected to an ADS-B or XM receiver, the radar imagery available on the Maps page is only Composite. The Lowest Tilt selection will be grayed out and unusable.

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Image 2. ADS-B and XM radar option is only Composite radar.

To learn more about radar reflectivity, the NWS JetStream Online School for Weather: Introduction to Doppler Radar article is beneficial.