Welcome to the screenshot below:
Question: what do I have to do to have better coverage? Will buying a new antenna help? Is it worth buying? How is it how and for how much?
Currently I have the one like this link:
https://obrazki.elektroda.pl/3228977500_1410197830.jpg
Ps. I live in the countryside, in the valley around 3 masts, the nearest 5km but behind the forest and hills
router:
Device name: B315s-22
Version of the modem hardware: WL1B310FM01
Operator: Cyfrowy Polsat

Question: what do I have to do to have better coverage? Will buying a new antenna help? Is it worth buying? How is it how and for how much?
Currently I have the one like this link:
https://obrazki.elektroda.pl/3228977500_1410197830.jpg
Ps. I live in the countryside, in the valley around 3 masts, the nearest 5km but behind the forest and hills

router:
Device name: B315s-22
Version of the modem hardware: WL1B310FM01
Operator: Cyfrowy Polsat