There are no listings in the RR Database for Portugal, but a search on the Internet says that a company named
Radiomovel operates a MPT 1327 trunk system by Tait.( Apparently in the 450 to 470 range, although no freq. posted)
In fact Tait seems to have sold systems to Military,Civil Aviation and
Public Access systems in Portugal.
Would a Uniden radio be of much use ?
There is software available on Radioreference to download (see download
page)
An example of it is here
http://unixforge.org/~tronkito/