Now for a reflector on one of my antennas I used chicken wire I had sitting around in my basement. Works great. But then your neighbors might consider you a redneck 
hee haw. But this is Texas, right?
BTW the Clearstream reflector is not a bad idea (or even an old satellite dish which people have used as reflectors). Talking about satellite dishes, the best antenna ever built was the Channel Master 4251 which was one massive dish type reflector and a tiny receiver element (really just an old-fashioned two bay bowtie). The humongous reflector would collect all the RF signals and like a magnifying glass beam them back onto the small Radio Shack type bow tie. To this day nothing beats the 4251. But it is huge! It is the Mona Lisa of antennas - a thing of beauty!
My wife and I were driving around one Sunday in the country and I spotted one on an old farm house. I whistled, “What a thing of beauty!” My wife looked at me and couldn’t see what I was looking at. “You lookin at a woman?” she demanded. No, I said, THAT antenna. She thought I was crazy.
Wonder what your balcony railing is made of. Lower the antenna and use the railing as a set of reflectors…