Why do I only get one channel on my antenna? Please help?

I got a digital TV indoor antenna for Easter last year and my dad hooked up my antenna. My dad did a channel scan but it only gets one channel, 42. My TV in my room is an older TV, so I need a new TV for my room so that I can get more channels like MeTV, Antenna TV, Decades, and all of the other channels.

I can't watch my TV in my room because the channel on my TV in my room right now has shows that are not good shows like The Big Bang Theory, the one talk show that is a bad show, and other filthy shows on that channel, so I always want to go over to my grandma's house to watch her TV on Sunday afternoons, but my grandma has to fill out paperwork for my great aunt's appointment because no one can do it for my great aunt who has health problems. My dad won't give me the TV in my parents' room and give the TV in my room to one of my dad's friends. My dad won't hook up the two antennas I have outside of my house to my room so that I can get more channels, and my dad won't hook up the boosters to the antennas that are outside of my house to my room.

I tried to tell my mom that one of my great aunt's children should fill out the paperwork for my great aunt's appointment for my great aunt, but one of her children won't do it. What could cause an antenna to only get one channel? Why do I only get one channel on my antenna? Can you help?

Thanks.