Looks like you are in LA so it probably won't help.
If your problem is weak signals with no static or other interference, then sometimes a good booster will help. For $7.95, the "good" part is iffy.
If you are in a metro area and have interference and static, a booster will give you louder static and interference and cause even more cross channel interference.
Still, for $7.95, you don't have much to loose. If it will pass signals without reducing them when it's switched off, then you could just switch it on when you are out in the boonies and it might help a bit there.