Thanks for the link. I had searched for the answer using Google before I posted this question, but the only answer I saw regarding power was "low power". Here is the data for 10 Meters (lower freq have less attenuation and higher maximum power permitted):
Coaxial Cable Attenuation & Power Handling Calculator
Frequency 28 (MHz)
Attenuation 2.384(db/100 feet)
Average Power 0.57 (kW)
Run Length 12 (feet)
Total Run 0.3 Attenuation(dB)
So it looks like I will be OK for my CW and SSB operation. (I don't run RTTY) Thanks for all the answers.