when a low flying passes overhead , we sometimes notice a slight shaking of the picture on our TV screen . Suggest a possible explanation .

Question

$\begin{array}{1 1} \text{May be due to interference between the direct and reflected signal } \\ \text{May be due to interference between the T.V signal and that form the ionosphere } \\ \text{May be due to superposition of the waves } \\ \text{None of these}\end{array}$