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Basically I took my C4V that is stacked horizontally and stacked them vertically. Used 2 300-75ohm converters to 12" equal length coax to a splitter used as a combiner. My result was a loss in signal to my FOX tower which is the hardest for me to get. I expected it to be as strong as horizontally stacked but I was wrong. The only problem I could think of was all these connections added up to a signal loss.
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You need to flip one of the baluns. Most likely, you're feeding the combiner/splitter with one loop 180° out of phase which will cause a big, giant dead spot straight ahead with major lobes skewed high and low.
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This is the C4 spec sheet I had found thanks to Google. I'm thinking the 70 degree width is from the to bubbles on the higher UHF channels.
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No. The HPBW is explicitly stated as 43° which is it's calculated value at the low end of UHF, it narrows to almost 30° at 698 MHz. Only the major lobe is considered when the HPBW is specified.