Hi, I wanted to know what the characteristics of the antennae that come with the MR600 v3 are (this is the version I received), and what antennae would you recommend to improve network reception? (I currently have 2 bars out of 3, and the "4G+" signal flashes every 15-20 seconds, so I'm guessing it's not receiving it well). PS: the 4G antenna is 500m from my house. Thanks a lot!