Posted for "Timothy Ong" <timothy.ong@leadingedgeaircraft.com>:

 See!  I told you someone would educate me :)
 
 BTW, We haven't done the tests Bob indicates, but we have seen vast
 improvements in reception and transmission.  Before we would typically lose
 a controller or have bad reception on cross countries.  These episodes have
 been completely eliminated.  Picking up VOR's way out is not a problem
 anymore also.
 
 As far as NAV antennas, we do use the wiskers in the vertical and therefore,
 do not need a groundplane.   Well worth it for good reception.  In fact my
 ES (all E glass airplane) has all external antennas except for the GPS.
 
 Regards,
 
 Timothy Ong