James Barrett wrote:
Hi, I just got my new (used) HF rig, and I strung up a half wave dipole
for 10 meters using 28.4 mhz in my calculations. Several hours later I
am getting an SWR reading of 2:1 at 28.4mhz. Is that pretty good or
should I try to do better?

That's marginally OK. What is the SWR at 28 MHz.?
What is the SWR at 29 MHz?
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73, Cecil http://www.w5dxp.com