|And if point to point system isn't for you (and Curt's advice here is very solid) then if you have a power cct. in the summer house, you might consider the homeplug approach. This is lan over mains approach, which uses mains wiring as the network cabling.|
Devolo in Germany were the first; they're available the UK and they are excellent. Sadly not yet available in Canada/USA. Netgear, D-link, Linksys/Cisco have them; and so do TP-link. The last one is very low on my list of preferences and recommendation.