Cell phone.
I know, not what you want to hear, but sometimes easy is best. If you don't have cell coverage, then you'll need to either change your expectations, or change your setup.
As stated by many above, the issue is your antenna. No reasonable amount of amplification is going to overcome that, and none of it will overcome the reception issues on your end.
Also, running high RF levels into an indoor antenna is going to result in all that juicy RF getting into every single electronic device in your apartment building, like everyones phone lines, cable TV, internet, fire alarm, stereo, etc. You will be in deep doo doo with your neighbours really quickly. They'll complain and you'll be the guy to blame. It won't end well, and you'll be out a lot of money and still not have what you need.
The most important part of any radio setup is going to be the antenna. Sticking a mobile antenna on ground floor of your apartment building is about the worst thing you can do. I know, you don't have any other options. But physics is physics and you can't cheat them.