Re: how can measure "power"and "SWR" for
If your antenna is HF or VHF, get a Bird wattmeter. They are the best, but kind of expensive. There are also cheaper competitors. You also have to buy an "element" that plugs into the meter that is designed for your power level and frequency band. To measure the power in the reverse direction, just reverse the element. With forward and reverse power known, you can calculate SWR. You also have to specify what kind of coax connector you want. I bought one of the cheaper wattmeters about 5 years ago, works really well.