Directional 433Mhz antennas?


I’m looking for directional antenna for my 3DR radios. Would it be possible to add a few links to the wiki (“Where to buy”)? There are 900Mhz antennas but no 433Mhz and I’m having a hard time finding them online.

The page I’m referring to:

Look for 70cm antenna designs, they are quite close in size and using the right sums you ca easily make your own.

Sorry but as I’m quite a noob when it comes to antennas, I’m not sure what you mean :confused: . Close in size to… the standard antennas? Sums?