PMR446 range

I keep hearing people say it's all about the power of the radio,i say no it's not,antenna and the height of the antenna is 100% what pmr446 is about,you could have 100 watts running into a huge beam or collinear but if that antenna is not above everything like roof tops then it just won't work,never forget uhf is line of sight so the antenna needs to be up as high as you can get it.