10 miles can be a lot or a little depending on what is in between. There are a lot of thick trees in my neighborhood so I need a little extra oomph to penetrate them. Had to have a good ground plane for the mag mount and also had to use 8w vs 4w. Finally was able to hit a repeater 10 miles away.
Absolutely. Also, those mics you can get will help. I am using one and also a battery eliminator. External antenna, mic, battery eliminator, these all really helped me get a decent, low budget, versatile mobile radio going.