In a frequency modulated wave:

$A$ $TV$ transmission tower has a height of $140\, m$ and the height of the receiving antenna is $40\, m$. What is the maximum distance up to which signals can be broadcasted from this tower in $LOS$ (Line of Sight) mode? (Given: radius of earth $R = 6.4 \times 10^6\, m$)

If the range of a $TV$ telecast is to be doubled,the height of the transmitting antenna must be:

If a transmitting antenna of height $105 \,m$ is placed on a hill, then its coverage area is (in $\,km^2$)

An antenna behaves as a resonant circuit only when its length is

An antenna of length $3 \ m$ will effectively radiate which frequency?