my question before i buy is im using flysky, should I buy the ia6b or the ia10b. The ia10b costs almost twice here, but as I go along, Im building a fixed wing drone with aerial mapping and fpv with the pixhawk flight controller. So, is a 6 channel receiver enough or should I buy a Ia10b.

   I have received advise from well wishers of buying from banggood or aliexpress, while they're right I don't have the time to wait. So please guide me those who have a good idea about this

It is better if you have more channels for pixhawk to take advantage of numerous options available.
However ordering a radio from outside the country is not recommended if you care for your money.
You have to deal with customs which is very risky,time consuming and finally may not be fruitful.

Get a ten channel.

You would be better off buying Frsky Taranis x9d

@Balakrishnaa Reddy and rishabh sharma thank you, I will go as per your input
@rcrcnitesh sorry I forgot to mention I have the i6 with the ia6. only concerned about buying the receiver. Had I the budget I would have easily taken the frsky taranais.

Get an Avionic Os-10 from www.rcbazaar.com ! Its THE best Tx for a very affordable price plus its Open Source for modifying and has several other features. Its a 10 channel Tx

whats its range?

1.5 KM is max range