Verizon S5 on AT&T network

I have a Verizon S5 and want to use it on AT&T network. I have the sim in and it works but internet is very poor. Does the Verizon S5 have the radio's needed to operate at LTE speed on AT&T network? If so could I flash an AT&T ROM on the verizon S5 and it work any better? Looking before I replace the phone all together. Please be kind on your response. I have spent the last 2 days searching many sites to find this out and none directly address this that I have found. I am familiar with XDA and flashing as I have been an avid reader for years.

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