I already have an 8 dbi antenna on the roof with lmr400 cable going inside my house. I would  need some advices on what to buy. A Heltec V3 would work fine or would you recommend something else ? 

 Is the antenna 915Mhz? SMA connector?
V3 probably would work. I use with a mag mount car antenna.  

 Yes I’m in Canada and yes with SMA connector. Looks like I’m ordering a V3 🙂 

 Thank you Sir 🫡