Satellite signals will pass through standard glass. If the glass is coated with some metal materials for thermal or UV reflection, that will affect or kill the signal. If the window becomes really wet, that can also kill the signal. If you can access the glass on the outside, you can coat the glass with some water repellant, and that should solve the water problem. Pam cooking spray works OK, but there is a water repellant for made by KingDome for RV domed dishes that is mind boggling in how effective it repels water.
I have also seen prototypes of a mount that stuck out the window and secured to the wall. It was on a hinge. Once you aligned the dish, you could flip the dish inside and close the window. To watch TV you open the window, flip the dish out and watch TV. Sort of an ugly looking option, but an option none the less.
I have not seen this device on the marker, but I have not been looking for it. The inventor emailed me some pictures a few years back, I will see if I can find them.