Hello, I am rather new to this forum.

I am apart of a Senior Design team at my university where we have to assemble a drone more or less from scratch as far as the body of the drone goes. In terms of electronics, however, some items we can get from the shelf.

I have opted to design a 2.4Ghz cloverleaf antenna primarily for video transmission and for it to be connected to my VTX. 
The TBS Crossfire TX has appealed to me as it can help with long range flight.
I read up on Oscar Liang's site about it: https://oscarliang.com/crossfire-betaflight/

Now here is my issue. The TBS Crossfire uses the 900 MHz frequency and my receiving antenna on the drone will also have to be 900 MHz. My question is does it interfere with the VTX's ability to send the video signals back given that the cloverleaf operates at 2.4GHz.

Thanks,

A Beginner if you've ever seen one.

If you are using 2.4ghz for video transmission and 900mhz for radio control transmission, then you will be fine. But I don't understand what you meant by "receiver antenna" also being 900mhz. If you are talking about the TBS Crossfire receiver interfering with the 2.4ghz, it should not. Unless you mount the two antennas too close to each other.

Hi. I'm no expert on this topic but I think that since the bands are so far apart you will be fine. And even if they were close, the digital protocol from radio signal should handle the interference.

Medium-to-long range pilots generally run a 900MHz RC control link with either a 2.4GHz or 1.3GHz video signal link (although with the latter a 433MHz RC link seems to be a more preferable option keep a bigger gap between the frequencies). Just be careful with your antenna placement as Voodoo said. Also, the higher up and away from the aircraft body (within reason) that you can get the active part of the antenna the better.