I don't know what you need for 300Mbps but the antennas are NOT DETACHABLE and if you DO NOT have a REALLY STRONG signal then don't buy it! Nothing in the admin panel shows the signal strength, which doesn't help. But I have one 4G/LTE device at 40Mbps and the other is a 120Mbps hotspot. This device has struggled to reach 5Mbps. Not 50. It's 5-FIVE point. UL barely reaches 2. Inserting a SIM card is also quite difficult. My iPad Mini 5 and my friend's iPhone 8+ got 240 Mbps with AT&T, but the hotspot is disabled on my service. So I'm looking for a standalone 4G LTE modem to use. NOT THIS! I don't know what's good about 300 Mbit/s WLAN if you hardly get 5 Mbit/s from the uplink.
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