A band filter will help you to maybe see further than 100 miles but you have other issues besides the interference.
If you receive aircraft further away but not the close by ones, the receiver is overloaded by the planes themselfves, thus you need to reduce the gain:
Thoughts on optimizing gain
or
Automatic gain optimization for readsb and dump1090 fa · wiedehopf/adsb-scripts Wiki · GitHub
The antenna isn’t mounted very well, it’s too close to the metal grid.
If that is mounted with tape … that is prone to fall down at some point.
At the very least use tape at the top and the bottom of the antenna … that at least should work until the tape is destroyed by the sun.
I suppose you could even use some plastic or wood between the antenna and metal and then wrap tape around it with a spacer at the top and the bottom.