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The length should be about about right(for FM). You can attempt to lengthen it, but not arbitrarily. Go with a 1m total. You must try to maintain a multiple of the transmissions wavelength(about 1m for FM). Try orientations of 0 or 90 degrees from the transmission source(straight towards or away, straight up or down, horizontal left or right at 90 from source). Try moving the antenna away from large or flat metal sources(may act as a destructively interfering antenna or ground plane). Give it a try, it's only time.
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