I ran ethernet down to my summer house about the same distance. The first 30m in external grade 25mm plastic round conduit, then underground. 1.5 to 2 spade d

I ran ethernet down to my summer house about the same distance. The first 30m in external grade 25mm plastic round conduit, then underground. 1.5 to 2 spade depth, 2" of gravel/stones/whatever to run water out. I used underground stable plastic conduit, weld glued together. At 0.75ish spade depth, I put a black/yellow warning tape. I ran two CAT6 cables. I ran a SWA (steel wire armoured) power cable down too in an earlier project and have four double IP66 (EU regs for water and dust ingress - 66 is good for an accidental spray from a hose) My garden backs onto a park and my summerhouse has a POE switch with an AP in it. I can get wifi in the park to quite a long range. I also have a DECT extender in the summerhouse. The range I can use my house phones (I have an IP PBX) is pretty mad.