Since I've been doing a million of different tests, thought I'd do a simple test with and without the diversity (or secondary) antenna that is used for mimo. I've been reading and learning a lot about it, and doing this test showed me a few things.
This was done actually inside my house, with the antennas (these antennas were used in this test: https://ltefix.com/shop/antennas/700-27 ... l-antenna/) facing out a window pointing directly at the known tower my service connects to. (I only did this because it was raining/wet outside)
Signal strength with both antennas attached:
Speed test with both antennas still attached:
Signal strength with diversity antenna detached (in this case the secondary, RxD in this screenshot):
Speed test with secondary antenna detached:
A couple of observations:
1. I did the speed test as quickly as possible back to back to try to reduce variables at all, and you can see in this particular test, I lost about 40% of my download speed. I've seen this vary a good bit, with other tests I did, so don't take this as a hard or fast rule of how much bandwith you will lose if you don't use a diversity antenna (spoiler alert: I always recommend using one.)
2. Upload speed is unaffected because there is no mimo in uplink, and hence the secondary antenna is not used.
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