Amstrad CPC 464 monitor will give you a blurry image compared to a good old commodore 1084s.
Commodore 1084s is fine for an A500, they are perfect for games (or watching TV using the TV modulator).
Anyway, if you live in Europe perhaps you'll have more fun using a SCART cable with your TV. It provides better picture quality than connecting trough antenna cable.
IIRC I owned a 1084S-D2, I think it was produced by Daewoo and supported 70Hz screenmodes
