To lower the resonant frequency of an antenna, the operator should:

The resonant frequency of an antenna is inversely proportional to its physical length. This means that as an antenna is made longer, its resonant frequency decreases, and as it is made shorter, its resonant frequency increases. Therefore, to tune an antenna to a lower frequency band, or to move lower in frequency within the same band, you must lengthen it. Changing the transmission line length does not change the antenna's inherent resonant frequency, but rather changes the impedance seen at the transmitter end. Similarly, altering the wire diameter affects the antenna's bandwidth, but not its fundamental resonant frequency.