Aka "turnstile"? On Thu, Jul 12, 2018, 9:56 AM Jean-Paul Louis wrote: > 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 ar= e > > 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 wavelengt= h > > 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 > > > -- > 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 .