Nighthawk M1 better speed with 2 Yagis

I have a Nighthawk M1 that I have been using several years with only one antenna (yagi). My speed was 70mb/30mb that for my use is good, but I was always wondering if I could get more speed using one more yagi. I decided to buy one more Yagi and put it in +45/ -45 degrees configuration. For my surprise now I'm getting 125mb/30mb. I got an increase speed of download of 55mb more. I think that's very good. I have a Galaxy S23 Ultra and I get the same speed and this phone is 5G and the M1 is 4G.