Why when sleeve antennas are used for high frequencies they are superior to single wire or regular whip antennas in both vertical pattern and impedance characteristics. I don't understand when it states the impedance characteristics of a sleeve Antenna can attain satisfactory standing wave ratios over a wider range and radiation at low angles is much greater than a whip?
You can find some information on the sleeve balum that maybe helpful here:
https://en.wikipedia.org/wiki/Dipole_antenna
https://en.wikipedia.org/wiki/Dipole_antenna
