Another option is to cut a 2x4 the width of the window, close the window on it, and drill as many holes as you want thru the wood.
I have used that at a town house that had no other way for the coax to get in. I did add a couple of F-connectors for the fm & tv antennas. Since I have moved to a normal house, I can run the coax cables through a PVC pipe through the wall in the radio room. It is still works great going on now for over 10 years with no problems. Did a second one for future lines, first one is weather sealed and no air comes in. The other one is capped until this spring when more antennas go up. At the time the MFJ for the town house was an easy option which worked for me but the other ideas especially the bulkheads mentioned above are another great option. I probable could have fabricated one like the MFJ one, but never had the time to do it.
Is your window crooked? Or it is the trim?