Sewage Ejector questions. Wet Vent

[mcfall9]

I am installing a bathroom in the basement I have to pump up to the drain. For lack of a better name the "Sewer Crock, pump" will need to be vented. Do I have to tie into and existing vent upstairs that runs to the attic-roof or can I tie into the sewer drain and use a wet vent ?

 

[Terry]

The sewage ejector pump needs a vent through the roof.