I would think you should get kgo without issues. I live north of sutro, over 50 miles away.
I would get kgo about 70% of the time using a cm4228.
At you distance, it should be solid all the time imo.
Antenna reception is a strange thing.
I replaced my y5-7-13 antenna with a y10-7-13 antenna, and noticed MAYBE a 3% improvement. I was expecting a much greater signal strength increase.