Outdoor Antenna used indoors Opinion-knowledge pelase

I live in a Brick Duplex apartment for now , listening to 800Mhz near Denver,Co

I,m using a Stridsberg Engineering MCA204M Vhf/Uhf Receiver Multi-coupler high up

on a Exterior(On the Inside ) wall with a R/S 800mhz Rubber antenna it picks up Denver Edacs ,but weak.



Do you think this Antenna (Indoors-inside) on the same wall would make a Difference ?



FG8246 - Antenex Fiberglass Base Station Antenna (824-896MHz, 6dBd)