wlaniot 900MHz Antenna Kit 3.5Dbi External Omni Rubber Duck Indoor Antenna with RP-SMA Connector + IPX U.fl to RP-SMA Cable Pigtail for Cell Phone Signal Booster Router Security Camera PCIe Cards 2Pcs

Tried these with 915MHz LoRa and I could not get more than 20' range. I guess you could could call this a LoRa blocker. These definitely aren't made for 900MHz range.

They work ok, I'll probably buy them again, but for my application I needed to use a M2F adapter. They're designed for a broad frequency range, so something purpose built will probably give you a higher gain.