Antennas are made of aluminium and plastic.
Both it and plastic get dirty,
and both of those conditions can cause signal loss.
Out in the desert, an antenna will often last decades
because there is little moisture to prompt corrosion.
In a high-humidity environment, an antenna will often last only three to five years.
Salty fog, as we get here on the central coast of California,
accelerates all forms of antenna deterioration.
Antennas cannot "be" digital, but they can of course receive digital signals.
Just call it a TV antenna and no one will complain.