Broadcasting antennas are generally

In the case of amplitude modulation,to avoid distortion,the modulation index $(\mu)$ should be:

For $VHF$ signal broadcasting,what is the maximum service area in $km^{2}$ that will be covered by an antenna tower of height $30\, m$,if the receiving antenna is placed at the ground? Let the radius of the earth be $6400\, km$. (Round off to the nearest integer) (Take $\pi$ as $3.14$)

In communication with the help of an antenna,if the height is doubled,then the range covered,which was initially $r$,would become:

The total power in an $AM$ wave is $1500 \ W$. What is the power transmitted by the carrier for $100\%$ modulation (in $W$)?

What is an antenna?