While no date is given for when this episode takes place, it is likely to have been 1983 or 1984. A clip from 'The Real Ghostbusters' (which premiered in 1986) was shown, but this is an alternate timeline wherein the Ghostbusters franchise was created a few years earlier than ours.
It is implausible a wireless bug would still be working after 9 years and never have been discovered as Jamestown was expanded.