I have a friend who is the GM of a hotel and has really old wireless access points. I don't know the brand name, but they seem about 7-8 years old. I was going to suggest a Cisco WAP, but don't know which one to suggest (they have some concrete walls). They have 3 floors with about 50 rooms to a floor. What would be the best AP's/antenna's to use for good range? He's looking to spend about $250~ per.