I purchased a Cantenna from Heathkit in about 1961 or 62. I remember
finding a gallon of mineral oil in a drug store at a low price. (It must
have been a really low price to impress me at the time.) It has been in the
Cantenna ever since, and still works well. I do not use it much, but I
sometimes run 100w or about 700w (depending on whether the AL-80B is being
used) without problems. SWR indicated in the 1.1 or 1.2 range. It was a
great investment.

Bill
W2WO