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Get a good active PEP wattmeter if you operate on SSB a lot.  It'll work on AM just fine.  The old GC meter and similar ones that are even available now will show the reflected power on SSB but generally poorly.

 

Look for a meter that either has internal batteries for the PEP circuitry, or has an external power supply (wall wart) to power it.  If a meter has no such power supply or batteries but has a front panel switch labeled "PEAK" or "PEP", walk away.

 

On the other hand, if you just check your antenna once every couple of days, the GC will be fine.