Has any one tried or know if you can hook up one   linear and one circular polarized antenna on the mavic pro transmitter??

Why would you want to do that? I mean you can go boost1.5w on the Mavic Pro and you have connection to 15 km away!

Flysafely
Alex

Hello and good day. Thank you for sharing this information with us. Just a reminder that we do not recommend using 3rd party devices for DJI drone or on your DJI remote controller. 3rd party devices might affect the drone or its component and can also affect the performance of the drone when in use. Thank you.

If you want, then yes, you can mount some new more powerful antennas.
The one I recommend is 4hawks raptor series, you have the sr and the xr versions.

Flysafely
Alex