TYT9800 quad band and works good. But as mentioned earlier, you are limited on antenna selection.
Even though the radio can operate on four bands, you could use it with an antenna for one band, two bands, or three bands. You don't necessarily need a four band antenna to use the radio. Just remember to not transmit on a band for which you don't have an antenna.
You are only limited by antenna choice if you want to be. There are a couple of antennas on the market to support this quad band configuration, but some people find the 10 m performance of these antennas lacking.
Yes, the radio is quad band and has a single antenna jack, so it is easy to get caught in the "I can only use one antenna on this radio" quagmire. But I use the FT-8900R attached to 3 antennas different antennas, a 2 m / 70 cm dual bander, a 6 m monobander, and a 10 meter monobander, all at the same time.
You come out of the radio to a duplexer / triplexer that splits up the bands the way you need them, and use any antennas you want. No muss, no fuss, no switching, and no possibility of forgetting there is not a good antenna connected on a band.
For example, out of the radio into a Diamond MX62M, this splits the frequency response into two ports, 1.6 - 56 MHz and 76 - 470 MHz, and then on the low band side of the MX62M out to a Diamond MX610. The MX610 splits the 1.6 - 56 MHz it is fed from the MX62M into two bands, 1.6 - 30 MHz and 49 - 470 MHz, resulting in two ports, 1.6 - 30 MHz and 49 - 56 MHz.
This provides you 3 outputs to connect antennas to, one is 1.6 - 30 MHz (allows 10 meters), one is 49 - 56 MHz (allows 6 meters), and one is 76 - 470 MHz (allows 2 m / 70 cm). I used this configuration for several years myself. You could use a slightly different combination of units if you wanted monobanders for each band of the radio.
The FT-8900R is quite an old design now, but still capable. It allows 4 bands, cross band repeat, is fairly compact, and has a remote head. The cost is not high, typically under $350 and I have seen it on sale for under $300. This means the quad bander is not much more expensive than a name brand entry level dual bander. And the knock off version of the 8900, if you want to take a chance on that, is often under $200.
I have, however, seen FT8900Rs loose a 10/6 front end when used near a 10 or 11 meter station with high power. Other than that the 3 I have here (one in my Raptor, one in my wifes Marauder, a third was installed in my Miata for several years, that one is setting on a shelf waiting to be installed in the new Miata) here have been pretty flawless for several years of operation. They can be MARS / CAP modded, if that is your thing, but it will NOT open up the 10 or 6 meter TX bandwidth, it only enhances the VHF/UHF TX bandwidth.
T!
(edit) Ooops, I see that while I was typing this KB4MSZ responded with the same input about Duplexors.
