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Well I got 75 feet of LMR-400 probably way more then I need.

I'm almost ready to set up the antenna but have a few more questions.


My roof is metal but I'm planning on getting the antenna up about 8 feet above the roof. 


I still need to get a SWR meter. But how do I test the swr? I'm using the Yaesu FT 7800R.


I have only tested swr on CB band but never on the ham bands so I'm just wondering what the proper procedure is.


Should I use the lowest power setting? 

And on what frequencys do I use for both the 2 meter and 440?