On flat terrain, maximum signal on the horizon will occur, right between 3/4 and 7/8th wave. If you can't get a good match with the aftermarket gamma, try the stock one. Especially if the aftermarket one is shorter. Selling a 10kw gamma match for the Vector is a bit of a gimmick since the connector itself is limited in power, right around the same place as the stock gamma. If you need to increase the power handling, the stock connector is the first thing that must go. Also, if the gamma is the one with red heat shrink tubing on eBay, it doesn't appear to be any larger in diameter than the stock one. The 10kw match Maco sold, use to be 3/4 inch diameter and only handled 10kw PEP. No where near 10kw average. If the tubing is close to stock diameter and only the insulation has been replaced with Teflon, figure on 5kw PEP before bang. The connector will get you, long before this point too.
The stock connector bracket can be drilled and tapped to accept the standard sized, single hole, threaded UHF connector, that is Teflon insulted. I don't recommend just drilling the hole larger and using the connectors nut to hold it in place because, the bracket material is thick enough that you won't have enough threads, to securely tighten the nut. This bracket has been upgraded and is now made from Zamak alloy, which is much stronger than aluminum. Meaning, you'll need a starter tap for this job otherwise, you'll just strip out the threads as you cut them, with a standard finishing tap. You can solder a round, "crimp on" eye connector to the center pin of the new UHF connector and bolt it to your heavy duty gamma match. The eye connector soldered to the top of the UHF connector, is exactly how Avanti made this connection 35 years ago on the original Sigma IV. Apply clear "GE Advanced Silicon 2" caulk over the back of the connector, to prevent water migration.
