Thanks for all the replies gents. I am in swamps of PNG for another three weeks so will tackle your advice when I get back home. The position of the house wireless router is in the wooden air vents in my kitchen. Wall construction is brick but the house does have 700 metres of steel earthquake reinforcing and about the same in electric cabling. None seem to have been a problem as far as WiFi working in the past. I will let you know how it goes.