I suppose so -- and I suppose also that they'd be narrowly focused S-band type signals sent from blowtorches like Goldstone, Madrid, and Canberra.
The question is: how likely is it that one could pick up such signals, even from big, powerful sites like those, at a distances on the order of light years?
I'd think it would be hard enough to detect extremely weak signals sent to us on purpose, much less incidental signals directed to (say) some alien version of Pioneer 10.
Leaving aside questions being batted about in this thread, what's your personal opinion of the likelihood of ever seeing such signals, assuming they were sent?
It would be difficult to detect such signals hence the size of the radio telescopes and networks combined with the large amounts of computing assets marshaled by the SETI project.
However, the last article I read stated that close to 1200 signals had been detected that can not be attributed to any known natural source. Which could mean that there are natural sources yet to be discovered or understood to account for these signals....or that there may be a few of those 'alien Pioneer' craft being noisy.