100-200 yds is not an "extension cord", it's a "power line", talk to an ELECTRICIAN. On construction site, if I ran cords 600' I'd have to dedicate it for one tool, maybe a screw gun. You did say YARDS, right. If you run a generator, take care if you try to insulate for sound, you don't want to cut the generator's ventalation needs & burn it out or set it on fire, talk to an ELECTRICIAN. What exactly are you looking to power up? Speakers, amps, mixing boards, lights, RV's, instruments, hot dog stands & popcorn kiosks, tanning booths. Depending on what it's for will tell you the size of power supply, talk to an ELECTRICIAN. In rural areas when we'd run generators & compressors the sounds can REALLY travel. Is this for personnel use, commerical use, industrial use, talk to an ELECTRICIAN?
Good luck
Barry