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The aerial can only be tuned at one frequency, which I would assume is mid band (or slightly higher - 700MHz ?).
Only a far more substantial construction than those on sale will have a match anywhere close to 75 Ohms without the associated mismatch, the designs I have seen play about with the spacing between the dipoles, some maufacturers don't even bother deviating from the dimension formula.
Only a far more substantial construction than those on sale will have a match anywhere close to 75 Ohms without the associated mismatch, the designs I have seen play about with the spacing between the dipoles, some maufacturers don't even bother deviating from the dimension formula.