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Some persons are afraid of heights... However, I'm afraid of widths......

Several thing I would not have done. 1. diamond u200 (worthless in duplex service, its a dual band HAM antenna) 2. LMR400 is a total no no in duplex service, you can and will have noise and desence issues. 3. Mobile Duplexer 4. Talk of purchasing a comet 712 (this is about as efective as a dummy load) If you are at all serious about this purchase a quality commercial antenna in the 460-470 range, I prefer folded dipoles like the DB-404, DB408 but any quality commercial antenna in the 460-470. As far as the coax, that has to go, for what you spent on that you could have bought some 213 or even 1/2 hard line for less then 2 bucks a foot. Now the duplexer, it you purchased one of the many Chinese mobile duplexers on eBay it will need to be re-tuned, its been proven over and over again they dont tune them properly. A better option would have been a used cavity type pass / reject duplexer. Rule of thumb, spend your money on the antenna, feed-line and duplexer because with out QUALITY components a 10k dollar repeater won't work with a poor antenna system. In the beginning I tried the cheep rout only to spend more money doing it right the second time. My first real repeater site was a 150' tower, I installed 7/8 hard line and a DB-420 antenna, since I had already spent all the money on the cable, antenna and climber I was left with an old 20 Watt Motorola R100 repeater that ended up having 35 miles of coverage around the antenna. It served us well for years, the next machine and still current is a Motorola MTR200 linked to 6 other sites. https://mwgmrs.com