Did you check in the past to see if you could get the O's on Extra Innings or ESPN? I was always blacked out on EI for the O's and last Tuesday when the O's played on ESPN2. If you weren't blacked out, you may not be in MASN territory.
I live just 30 miles from D.C. and Dish told me that my zip code doesn't qualify for MASN1 or MASN2. I can get CSN though. I told them to put me back to the regular AT100 instead of the plus. There must be a very small area where those channels qualify.