Guys, I would not have develped these antennas if it were not for a rich guy in Taiwan who is a long standing customer, I upgraded 4 of his P2V+ prior to the Inspire. He said money is no object, here's 1K for you to design something specific for this.
Here's a guy who reached 6km with the stock setup and the extended battery (he said he still had 30% left in the tank after that flight) but wanted something more directional since 6km was very hard to achieve with aiming in mind... With these 10km in perfect conditions is possible, but batteries will only allow 7.5-8km tops and then back. We install these ourselves to insure a quality install. I only etched 100pcs for the first batch and they sold out in 24 hours....

getting ready to order a second batch from our trusty Texas based pcb partner.