Yes of course!
If you search on internet for DIY half wave dipole antenna you can find a huge amount of information on doing them.
Personally I followed a little tutorial found on our Italian RC forumHere it is
I bought some of these connectors, you can search on ebay for SMA Plug/SMA Connector.
From left to right:
The connector, the central pin and the outer collar used to connect flexible wires. I didn't use this collar because I soldered the connector directly to the antenna arms, to lower possible power losses due to extension cables (see picture below).
You must buy them according to the kind of plug you have on your RX/TX 433mHz module (male or female SMA plug).
Then I took a piece of fiberglass/copper plate and I made a hole (3mm) so the connector can pass it, like this:
The piece is 8mm x 24mm. You must practice a cut on the copper to isolate ground from the power section of the antenna (in italian "Solco di divisione sul rame").
Then you solder the sma outer part to the ground (the right part of the image above).
Use a powerful soldering iron (60-80W) because you need a lot of power and a short time for soldering, otherwise you risk to damage the plastic/teflon insulation ring inside the sma connector.
I used some iron wires 0.8mm or 0.6mm diameter, the ones used to make bowdens and their plastic tubes.
One piece must be soldered to the ground. The other must be scratched to let it pass trough the back of the central pin of the sma connector. A little tin will be used to fix it to this iron cable once inserted in the back of the central pin.
Then you must calculate the sections to make a "U" so the iron wire and the central pin are in place and the wire must touch the VTR/Copper plate on the opposite site than the ground arm. The power arm must not touch the outer portion of the connector otherwise the antenna will be in short circuit and you risk to burn your module..
You can use a little bit of thermo retractile tube to insulate the power wire from the outer section of the connector (see picture above).
So set in place the wire and make some signs with a pencil and bend the cable according to your signs.
Solder the power arm to the plate copper like in the picture above.
Cut the wires at 163mm from the end of the VTR/copper plate and insert them into the plastic tubes, with a little bit of hot glue to firm the tubes in place.
With this antenna I use APM Droid planner (now Tower) on my Samsung note 2 at a distance of 300m without warnings!
I think I can go far away but I didn't try yet..
I made 2 antennas, one for the quad and one for the GCS. The only problem is that they are big and can interfere with your hardware setup on the UAV..
Here a nice solution..