darn it, I just deleted a long post. That's what I get trying to operate two PC's at the same time.
In my other life, I search for and mitigate RF interference to wireless networks like T-Mob's. Probably the single biggest offender is cellphone booster amps. They're typically installed improperly or crappy quality, or set too high ( gain). Separation of the donor and server antennas is the most important factor to consider. If too close, the amp will oscillate and produce a lot of wide band noise (similar to a microphone feeding back). The noise affects everyone in the area. Turning the gain too high could also cause oscillation even if the antennas are reasonably spaced. The gain is like turning up the volume or power on the amp. Some people seem to think more power is always better and turn it all the way up.
Picture a large room full of people with a speaker. The speaker is the cellsite and the people are the cellphones. The speaker and people are talking to each other. As long as the room is quiet, they can speak without having to yell. Then the loud talker booster amp guy enters the room and now everyone has to yell to be heard by the speaker. They have to be louder than the booster guy. Some people in the back of the room will not be heard by the speaker. Let's hope they're not having an emergency like trying to call 911. Data rates for everyone go down because the data transmissions have to use more power just to get through and have to retransmit more data packets.
Wilson seems to be serious about their amps and builds them with anti-oscillation circuitry and applies for approval from carriers and FCC. This is why they're one of the few, if not only legitimate consumer grade 4G LTE amp on the market. LTE is more sensitive to noise as described above and will become even more so as carriers move to voice over LTE.
Make sure you get the proper amp for the carrier and service you have. If you have a 4G LTE device, look for a 4G LTE amp that operates specifically on T-Mobile bands. Keep in mind, that if you change carriers and go over to Vz or ATT, your amp will likely be useless there. Mount the antennas away from eachother. Put the donor antenna as high as practical/possible and the server inside the cabin. Test setting the gain at different levels and keep as low as possible.
Understand also, that your range will be limited by other factors as well. High speed data requires accurate synchronization. As you move create distance, you add time to the delivery of data packets. If your packets are arriving late, your data will slow down to allow time for the packets to arrive. Also, there area areas like the Gulf of Mexico where other companies have the same frequency band licenses as land based operators. You could be causing interference to an oil platform operating in the same bands while sailing 10 miles offshore. They are likely to just blame the land based carriers though.
Your radar operates 9.3-9.4 GHZ and wouldn't be a problem to the amp or cellphone. T-Mob does have some operations in the 1900MHz PCS band and the 5th harmonic would be in that area. The amp could trash the radar possibly, especially if close and in the same plane. The spreader would be a good place for the donor antenna, provided it didn't cause any issues with the radar ( probably won't). Try it and see.
So most important, don't go with a cheap chinese amp, get one that covers your carrier and device type, install the antennas properly, and keep the gain at a reasonable level.
Oh, the FCC has a resolution out there that requires the user of these amps to "register" them with the carrier for approval. I don't think any of the carriers want to get into that and none, as far as I know, are actually doing that.
I agree though, for years in the corporate world I had a company supplied AT&T phone and my personal Verizon phone side by side every day. Verizon kicked its butt all over the US, not just in Maine...