Lack of internet

[PapaBear]

Hi all, as some of you know i have been struggling with the internet lately  our only means of internet is by a sim card in a router, we have a hill and a forest which interrupts our line of sight to the mast. Wondering if  its worth getting one of these external antennas and sticking it on a long pole up on the chimney. Reading the boards and looking at loads of them on line i'm still not sure, just wondering if any one has  had any experience  with this. Its only until 2020 when we are promised some sort of decent internet