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Yes they are unbalanced. Anytime you feed any type of balanced antenna directly with coax cable it results in an unbalanced condition at the feedpoint. Coax cable is an unbalanced feedline with one side grounded (the shield) and connecting it directly to a balanced antenna results in one side of that antenna being grounded and the other side not and thus unbalanced. You can make a 1/2 wave coaxial balun as shown in my link above which preserves the balance as well as performs a 4:1 impedance ratio for use where the feedpoint impedance is low, as in my 6m yagi. Using the hairpin (Beta) match allows the driver element to be grounded but since both sides are grounded equally thru the hairpin it remains balanced.