sgim70, I'm one of the biggest FPVLR evangelists around here (I have all the antennas I'm about to talk about personally) but I am a realist and want to make sure you get what you need. First let's talk about the antenna for your transmitter: indeed you need a nice omnidirectional antenna because you want to transmit a good spherical pattern FROM the Phantom and that FPVLR Pentalobe is one of the best, however you can go with less expensive options as long as they are omnidirectional.
On the receiver side is really where you're going to make or break your performance (imo). Having another omnidirectional antenna on the receiver (your goggles I think? Fatshark?) means it will receive from any direction... you don't have to keep it pointed at the phantom, but you sacrifice range. So if you're flying with goggles at say under 500m distance, you don't necessarily need that helix you linked. In a zero-interference environment with my 400mW transmitter (yours is stronger) with the pentalobe on the transmitter and the FPVLR pinwheel on the receiver I got a bit over 600m before the signal was not useable... gotta tell you that's premium distance with an omni antenna on the receiver... I have a buddy with cheap cloverleafs on the Tx and Rx and he gets 150m max.
Now about that helix... that's a DIRECTIONAL antenna meaning you need to keep it pointed at the Phantom at all times, but the range is amazing. I've been out to 1800m (over a mile) and plenty of people have gone further... so if you need that kind of distance you're going to have to get some sort of helix, and that one is the best it's the perfect balance between range and not having to be TOO precise with where it's pointed (the longer the helix, the more directional it is meaning you have to be more precise with where you point it).
Here's my point: When the helix is on a
display it's a lot easier to keep track of where the Phantom is, goes, and just turn yourself slightly to keep the antenna pointed at the Phantom as it moves around. If you attach that
helix to a set of goggles, it will be a lot harder to keep the helix pointed straight at the Phantom, since the goggles are much more immersive plus you can't see the antenna to know exactly where it's pointed. I think it would be frustrating to use on goggles.
Are you 100% goggles or do you have a display also? My personal recommendation is you get the
FPVLR ultimate kit which has the pentalobe for the transmitter, and both the helix AND a pinwheel receiver antennas. You can use the pinwheel on the goggles when you're not going for long distance, and switch over to the helix if/when the range of the pinwheel isn't enough or you're flying display vs goggles.
