Neil, A lot of pro drone users use cloverleaf antennas to do exactly what you do. Google "cloverleaf antenna" and you will see a good list of designs. Just my $0.02, Jean-Paul N1JPL On Wed, Jul 11, 2018, 2:39 PM Neil wrote: > Okay antenna gurus, I can use some help here please... > > I'm using a 5.8Ghz video transmitter/receiver system on a robot (2D > driving, indoor). These systems are popular with the drone-racing > crowd, but most of the good antennas are either circular-polarized (so > they are uniformly effective at most angles) or patch antennas which are > apparently very unidirectional. Linear antennas have mostly gone away > for this purpose. > > I'm trying to maximize signal strength/reception so the operator can be > in a different room and on a different floor. For my purposes, I'm > thinking a linear antenna on the transmitter side (robot) may be best > though, as I can mount it vertically in the robot body, and perhaps use > a patch antenna on the receiver side as that would have minimal > movement. Or linear as well for the receiver. I understand that whip > antennas are really crappy so would a straight piece of wire work > better? I also discovered "collinear antennas" while searching. > > I have about 18-20" of room to put an antenna vertically inside the > robot ... would having an antenna length of a multiple of the wavelength > work better than just a single-wavelength antenna? > > So what say ye? > > Cheers, > -Neil. > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .