Max length of CAT 5 cable for DATA and POE = 100 Meters or approx 385 Ft.
If the distance to your shack is over 300 ft, you will also need to consider an additional 5 to 10% for cable installation.
Run the power cable and add a cheap-o powered switch. The use the AC drop to power the camera as well.
U.S. v. Minker, 350 US 179, "Because of what appears to be a lawful command on the surface, many citizens, because of their respect for what only appears to be a law, are cunningly coerced into waiving their rights, due to ignorance." (Paraphrased)