Alcandrumque Haliumque Noemonaque Prytanimque. (767)
Apparently the only exact reproduction of something from Homer in the Aeneid.
Ἄλκανδρόν θ᾽ Ἅλιόν τε Νοήμονά τε Πρύτανίν τε. (Il. 5.678)
And then Ovid used it as well (Met. 13.258).
It may be the only *exact* reproduction, but then again it's not particularly easy to create a 1-to-1 reproduction from a different language in an hexameter.
Apart from that, there are some estimates that about 6,000 verses in the Aeneid are inspired or allude to Homer in some way (which would amount to 2/3rd of the entire opus).
I think you insert "direct" quotations like this one to root yourself within a line of outstanding poets. Vergil also makes a direct reference to Ennius in book 6 when he writes
tu Maximus ille es / unus qui nobis cunctando restituis rem (v. 845f.)
I've once heard that even Homer had 2 or 3 lines that actually won't scan in Homerian Greek, but make sense in the Greek spoken some 300 years earlier (which, if that's true, suggests that Homer's poem wasn't just a mere invention by himself, but implies that at least parts of it are based on a longer tradition of oral history)... unfortunately, being no scholar of Ancient Greek, I never really investigated that myself. It's just something I've heard in a presentation by Joachim Latacz once.