Wireless broadband is marginal here, viz. fails for 5 min. to 12 hours once a month or so, and no one knows why (est. 1 or 1.5 miles to the nearest cell phone tower.)
As soon as vinyl (-clad steel) windows were installed, replacing all-wood windows, reception became no good (ISP's wireless modem scanning all the time without ever locking to a signal.) Do steel windows create a sort of Faraday cage preventing connection?