simulation

I WANT To DESIGN A MULTI MODE SHORTWAVE ANTENNA AND IT'S FIELD PATTERN MAY BE ADJUST.HOW TO REALIZE IT? CAN YOU GIVE ME SOME ADVICE?THANK YOU!

Because of the large wavelength you will probably not be able to set up an antenna farm of verticals that are phased together. The next best thing would be a loop antenna which had two nulls. You could then mechanically rotate the loop to point the nulls in the desired direction.

thanks.I have a multiple-arm conical log-spiral antennas which now have three mode.and I also design a feed network to match it.now i want to make it's field pattern steerable.do you think it is impossible?can the loop antenna array reliaze three mode?