500m high and still have FPV https://www.banggood.com/MJX-B2W-Bugs-2W-Monster-WiFi-FPV-Brushless-With-1080P-HD-Camera-GPS-RC-Quadcopter-RTF-p-1144178.html?p=E701149844044201704V
used for this build: 4x Clearview Racing receivers (http://www.iftrontech.com/product_info.php?cPath=79&products_id=219) 4x CVBS/SDI converters (http://www.aliexpress.com/item/2015-New-Style-SDI-Converter-Adapter-VGA-CVBS-to-SDI-Support-Full-HD-SD-SDI/32567683064.html) Decimator …