Fine - but if you want to be right - you first have to prove why you think that you are right.
A good example comes to mind.
In the 1970's Avanti came out with a antenna called the Moonraker IV
It was horizontally as well as vertically polarized.
Probably not a new idea, but one thing that you could get with that antenna was a switch which allowed the use of one coax for two antenna's.

Don't you think that it would be easier to use a Diamond X 510 antenna and a 220 MHz and switch them up on the tower then it would be to use a duplexer and try to use both at the same time.

220 is dead except for maybe in the city somewhere where someone has a repeater... No manufacturer makes a 220 transceiver, except as a after thought - the only one I see listed in the AES / HRO catalog has a output of 1 watt.. I guess they use it to control a repeater site or something like that.

200 Mhz offers the benefits of being a little more ground following - like 2 meters, while being a little quieter - like 70 cm.. Rule of thumb - noise is inverse the square of the frequency.. The higher in frequency you go, the less noise you have to overcome. Probably the reason why cell phones are 869 - 913 Mhz and public service is going to 800 Mhz and the T band.