A ratio station has two channels . one is AM at $1020 kHz$ and the other FM at $89.5$ MHz. For good results you will use

Question

$\begin{array}{1 1} \text{longer antenna for the AM channel and shorter for the FM} \\ \text{shorter antenna for the AM channel and longer for the FM} \\ \text{Same length antenna will work for both } \\ \text{information given is not enough} \end{array}$