get signal to an outbuilding approx 100ft away.

I also have BT hub but need to get signal to an outbuilding approx 100ft away. The building is not on the same ringmain as the house and I have tried the best wireless extenders I can find which almost, but not quite reach far enough. Is there an alternate I could try such as a buried cable or getting BT to put an extension in ? If I cable it then the distance is closer to 150ft from the BThub

I am also not a tech expert

Thanks in advance!