Hi, I have few experience of receiving lightning strikes signals and far AM stations of thausands of km. In the case, antenna element needed as long as possible. That works well. Now I am trying to make an analog TV receiving antenna for 470MHz, half wave dipole. Do I need to calculate element length as formula or need to use as long as possible antenna? Resonant antenna is for transmitting or receiving both? I will make a half wave dipole and make a coiled balun near dipole to balance the signal. I think it works.