I have the Bullet as well and it works great! I use it to amplify a weak wifi hotspot provided by my cable company.
The POE injector I use is a 12v input model :
from B&H catalog:
passive power over ethernet
model APOE 02-WM
I can feed it with a 110 to 12v adapter while on shore power, or use a 12 volt plug while underway. Can't beat the price!