Mobility 42G gains without metal ground plane/plate

I have a question about the gain values for when the Mobility 42G is used without a metal ground plane. I have a fibreglass travel trailer and was thinking of mounting the 42G to the included ACW-881 L-mount, so obviously there’s no ground plane then. I have searched the web, but cannot find what the gains are for the 42G without ground plane. Anybody know where I can find this info?
Thank you kindly!
Rich

Hey Rich,

You can usually find this on product spec sheets.

Page 2 of this spec sheet,
pepwave_mobility_42G_datasheet.pdf (peplink.com)

Nik, thank you very much!