So I'm currently building my first 6S setup. A 5in racing quad based  Wild Frog Dew GTF 5 frame pictured below and I'd like to use a betafpv 2.4GHz RX with built in ceramic antenna for it. I've never used 2.4GHz with ELRS on anything bigger than a tinywhoop, especially no ceramic antenna receiver on a carbon frame.
   
How should I mount that receiver witht its ceramic antenna? Can I just put it on top of the stack? I imagine the top carbon plate will obstruct the signal a lot. So if not, probably on the side?

If you have used a ceramic antenna RX on a 5in quad build, please let me know how.

I don't have a ceramic antenna on a powerful 5" carbon frame quad, neither will I ever have. No matter where you place it, it will be partially masked by something. Not good.

I had a 3" with a ceramic and I mounted the Rx on the top plate on double sided foam tape. There was evidence of signal being weakened more than I thought fully safe, and I did see unwanted and worrying signal drops. I promptly replaced it with a Matek dual antenna Rx with the antenna clear of obstructions and at 90 degrees to one another, no more drops at all.

I use ceramics on all my 65mm and 75mm ducted build plastic framess and at the range I operate these are great.

I'd grab a n HM EP1 and zip tie the dipole to the 3d print vtx antenna holder on the back. A ceramic is just too much of a gamble on an expensive quad unless you intend to not fly it more than 100m away from you. I've done 200m in open air with perfect LoS on a ceramic without issue, but fly behind a tree and LQ plummets unless you jack your output to 1W, in which case you might be able to fly out to 400m, but you need to mount it somewhere away from the CF frame on the top, that has good LoS on all sides to you, which is hard if the battery is also on top.

If it was me, i'd buy an EP1 and just be safe with it. Skimping on a $14 part is good until your quad falls out of sky and you smash up the frame or break an arm off, then $14 might turn out to be cheaper than what you pay to fix the quad. Ceramics are good for whoops and probably up to 2-2.5" close in quads, but the second you throw in trees and buildings they aren't so good or you end up using crazy amounts of rf power to maintain the link.

So far I've only ever used elrs 2.4ghz with tinywhoops. I use elrs 900mhz on my 5in 4s quads.

I have a couple of these tiny betafpv ceramic antenna receivers so I thought to use one, but after I read these replies and I also watched some YouTube videos showing lq dropping well within 400m (probably due to trees).

This racing quad is for fairly short range flying, but I gave lots of obstacles (mostly trees, but also buildings, including metal ones). So I ordered a radiomaster ep1 with an external antenna, but now I have doubts if 2.4GHz is even appropriate for this environment.

Just jack up your power on the Tx side to 250 or 500, that should (probably) correct any LQ issues. I would try it first before you start dropping money on alternatives like Crossfire or Tracer. I find at 250mW with Dynamic On, I get rock solid stable out pretty far even flying around bandos and dropping out of the area I fly in and into a different area with zero LoS. Just remember higher packet rates equal less distance, so if running 500hz or 1000Hz, don't go too far. Beyond that, you probably want someone who does racing to give you advice on boosting penetration.

i doesnt like the ceramic antenne for the reasons pathfinder named.
the tiny dipole 2.4ghz arent as good about signal compared to 900mhz about mounting either.

i know a few pilots race with ceramic antenna, it should work on short range, elrs is magic :-) i dont know anyone went into trouble by the use of ceramivc antenn in a racer, but bo trouble also doesnt mean its the most decent link quality.
i wouldnt care to much, i would expect 700m decent linkquality.

you might need to switch modes, some whoops spis cant all modes.
for the ceramic antenna and short range "d500", two times the data for solid link, might be a good choice.


one buddy does use the flat antenna receivers from betafpv in his racers.
whats sure about these antennas, they are awesome for practicing in short range, they arent exposed and therfor best choice for crash and fly, repeat :-)



if i would aim best link on a tiny antenna, i would mount it above the topplate, but that would decrease durability a littlebit. if the fin is printed in decent nylon, i would choose the top.

Mount it behind the fpv camera. That's a good place for it in my experience.