De or het radiomast?

The correct Dutch article is:

de radiomast

How to use radiomast

the radiomastde radiomast
this radiomastdeze radiomast
that radiomastdie radiomast
our radiomastonze radiomast
your radiomastjouw radiomast
every radiomastelke radiomast
which radiomast?welke radiomast?
a big radiomast / the big radiomasteen grote radiomast, de grote radiomast