(The Technical Analyst) Investor apprehension following new stock market highs is often misguided and we should conquer our fear of heights, says Ari Wald, Technical Analyst at Oppenheimer.Looking at the S&P 500 since 1929, Wald points out that the S&P 500 has averaged a 7.0% gain over the following six months when reaching a new 52-week high for the first time in at least six months.