help-CENTER LOADED ANTENNA

hello

can any one tell me what a center loaded antenna is? i have heard that it is constructed using a coil and capacitor resonant to the desired frequency.please tell me how to construct it.

http://www.smeter.net/antennas/midload.php

http://www.ibcast.org.pk/IBCAST%20Pr...e/WCR/3221.pdf
http://www.smeter.net/antennas/helix-2.php

Monopole antennas,
Melvin M. Weiner, Marcel Dekker, Inc, 2003.
https://www.edaboard.com/viewtopic.php?t=170146

regards,
balaguru.