It's the same everywhere. VA Aid and Attendance rates are federal and identical nationwide, including for veterans and survivors living in the Milwaukee metro -- they are not Wisconsin-specific and don't vary by county within the state either.
More detail
This is worth stating plainly because so much of the rest of senior-care planning in this guide is deliberately Wisconsin-specific -- licensing types, Medicaid programs, ombudsman structure -- so it's a reasonable assumption that VA benefits might work similarly differently by state too. They don't. A veteran's Aid and Attendance eligibility and rate calculation is governed entirely by federal VA rules, meaning a Milwaukee veteran and a veteran anywhere else in the country go through the identical federal process and rate structure. That said, how a family combines Aid and Attendance with Wisconsin-specific programs like Family Care or IRIS is a Milwaukee-relevant planning question worth discussing with a benefits specialist at your county ADRC.