A few weeks ago I mentioned to some friends that my wife and I were considering cutting off our cable TV services and simply going with their RoadRunner service for Internet, getting a Roku 3 (about $95) and an HD antenna (about $20 for a basic model from Amazon.com). Weʻre figuring that if we cut the cable TV weʻll be saving $80 or so a month. The HD antenna has not been all that we had hoped. We get the following Hawai‘i broadcast services from our place just above the new Pu‘u Kukui School and below Wailuku Heights: 4.1 –…