City, County, and State would be needed information to determine the proper scanner.
Also, which agencies would he want to monitor?
Once those questions are answered, the opinions will be plentiful - along with which antenna would be best for the application. Which brings up another question, are there any restrictions in the development where he lives? How about rural or more urban location? Is it open, or are there a bunch of buildings around? First floor, or third floor?
So much goes into a decision to make a scanning hobby enjoyable.