http://www.hdtvprimer.com/ANTENNAS/types.htmlThe bandwidth of a Yagi can be increased by sizing the reflector for the lowest frequency of the band while sizing the directors for the highest.
Nice install loveota!! Have you ever tried moving the antenna up or down a few "inches" in additional to tilting? Vertical fine tuning has greatly increased relaibility of difficult stations more than once for me. I usually start around 10 feet above the roofline, but surprisingly enough find better results when I lowered the antenna 6 to 12 inches. A recent install actually worked best at only 6 feet above the roof with the 91-XG. Raising it just one inch completely wiped out 1 desired station.I`m still interested in the idea of bigger reflectors to improve gain abit to help with the fallout of some stations.
Keep the metal pieces small. Plumber Goop/Locktite Plumbing and Marine adhesive dries harder and holds better than silicone sealant for that purpose. Its also as electrically inert as silicone sealant.if I put small bolts in them thru the exisitng holes and a metal clamp with a twist screw on the back to tighten up the reflectors will it interfere with the antenna?
Well, I tried adding a second piece of 1" X 2" mesh from a 4221 clone to my 43XG (which is my second 91XG with a boom section removed).I added a boom section to my 91XG. It seemed to help somewhat but it was nothing earth shattering. My next mod is to try adding mesh to the corner reflector.