I can second that about the iskra's
Rural Northern Ireland test 2:36pm using 2xiskra p60 antennas
Rural Northern Ireland test 2:55pm using panorama antennas WMM8G-7-38 | 4G/5G LTE
I can confirm that antenna's are not just snake oil because without I have emerency calls only inside and outside of my properity from all of the big 4 providers
the panorama panel antenna has a max of 9dBi and min of 6.5 and a cable length of 6.5m
the Iskra has a nice flat curve of 9.5dBi at the lower 800MHz going to 10 very quickly and peaking at 11.5dBi across it's spectrum
both options cover 5G 3-4GHz spectrum
The only tower I have in my area which I connect to is 4miles away and covered by very tall hills, feilds and trees with no clear line of sight, I've tested higher up on the roof of the house but my best signal is lower down below the first drain pipe because i'm clearly picking up reflections.