Quote from Hello_Dollars:
MYDemaray,
I agree. Straight calendar spreads, or any vega positive trades, haven't fared well the past 5 months. But, in response to your question, there are ways to play theta while being vega neutral or vega negative. With regard to the latter, you could always do my favorite trade -- the iron condor -- which is simply selling a strangle and buying a further out of the money strangle, all with the same expiration. As you can imagine, the trade has worked very well the last 3 months given the extremely narrow range we've been in.
But with regard to your specific question as to how to be theta pos and vega neutral, one way that comes to mind is to ratio and diagonalize both a call and a put calendar spread by selling more near term closer to the money options than the longer term OTM you buy. The profit graph is similar to a butterfly spread though it's a credit trade and has unlimited risk in either direction. Finding the right combinations to result in vega neutrality just takes a little math.
However, the problem with that position, in addition to the unlimited risk aspect, and the problem with most vega neutral positions I believe, is that they become vega positive (or negative) pretty quickly simply due to the passage of time. Thus, to maintain vega neutrality, you'll be forced to make frequent adjustments to the position, which can get costly.
Hence, my personal preference is to play the ranges, sell theta and live with some exposure to vega one way or the other.
Hope that helps.
Regards,
HD