pajonk, I live in the same growing zone that you do, which happens to be zone 6. So your plant is almost 5 feet tall. I grow mine in the ground. Do you have enough space to do that in your yard? From what I've seen it's very difficult to get bananas to fruit in a pot. I'm not saying that it can't be done, but it's hard and takes a long time. Just putting it in a window may not do the trick. What I suggest is that if you have the yard space, plant your banana in the ground outside. Just before the first frost comes, dig it up, remove the leaves but keep the unfurled leaf on the plant. Store the banana plant in a cool (not freezing) dark place until next spring. No water or light what so ever. Plant them in the spring and the bananas will get MUCH taller than in a pot. My bananas are now about 12 feet high! pajonk, read this thread here that I created about my banana growing experience this summer. I started them outside in the spring, one was overwintered outside as well.
http://forums.gardenweb.com/forums/load/banana/msg0423500118531.html?12563