Topband: min megohm res = ok coax

[Ed Hughes]

Using 7/8 inch catv cable 1100' long to feed beverage system. Cable has been 
in place abt 25yrs. Gonna go out today & clear both ends of the cable & take 
res measurement (center cond to shield) with a good "fluke"
meter.

What would be considered a minimum "megohm" reading
for continued use on 160 ? I know I "will" be getting a reading on the meter 
! Would be great to get no reading but don't think thats gonna happen.

Ed KG4W