You might consider going with a directional antenna rather than that omnidirectional. The omni is fine for stations that are close (and it picks them up equally regardless of where they are transmitting from).

A directional antenna has to be aimed at the station(s) you want to receive and will get a better signal in that direction. But this won't work very well if the stations you want transmit from wildly different compass directions. Take a look at fmfool.com - you put in your ZIP code and it will tell you (a) what you can receive and (b) where it's transmitting from.

Also - with either type of antenna - raising it to a higher height will help (sometimes a lot) with reception.

Finally - if the total run of cable between your antenna and your receiver is pretty long (say 50 feet or more), you could try adding a preamp; the preamp mounts on the mast between the antenna and the cable feed to your house and you put a power injector on that cable indoors to provide the preamp with power. That will help if you're losing signal due to the length of the cable run. Any TV preamp will work for this (as long as it either doesn't have an FM trap or it has one that you can disable).