Camp dish setup help

I am trying to set up tv at our deer camp in a remote location.  I am using a H24 receiver and I believe it’s a slimline 3 receiver. I know the elevation and skew on the dish are correct for the area. I know my mounting pole is level. I plug in and get zero readings on the satellite setup.  

potential issues I have identified:

1. is the coaxial from the satellite supposed to go to some power source before it goes into the receiver?  Mine does not

2. If I’m picking the incorrect satellite on the drop down list going to cause me to get zero readings when aiming the dish?  I’m unsure if I’m selecting the correct dish on this drop down. 
3. there’s a tree about 50 yards away that could be in the direct line of the dish. Could that be the issue and I need to change my mounting location?

any help is appreciated.