Just want to confirm that you replaced the antennas and not just the mounts. BTW, use the rubber mounts, they are much better. Especially for mowing since they will flex out of the way with it comes into contact with something. See pic below.
Oh! Hahaha 
, so it’s absolutely clear I know absolutely nothing about my Yarbo. Lawn care is not my forte, and it is showing. So, it turns out I swapped the mounts, not the antennas. 
But you learned something and did an upgrade in the process! That’s a win! 
If you do happen to have some spare RTK antennas, throw those on there.