Best radio chip/s for the job?

Question

Here are my 2 scenarios: 
 
 I need a radio chip that will be used to form a mesh network in dense bush with each node up to 150m apart. Is this possible? 
 I need the best chip in long range communication and smallest size. 
 
 Thanks

Arnaud Nelissen · Accepted Answer

You should stay in sub-GHz modules for ranges like that, especially if you don't want to consume lot of power. 433MHz or 868/915MHz depending your location and legislation that applies locally.
433MHz modules generally use a 2x longer 1/4λ wire antenna than the one used for 868/915MHz (16cm vs 8cm for example), but might provide increased range. 
 Have a look at the NRF905 or the NRF9E5 (SoC) from Nordic. 
 You could also use RFM69 ( W @13dB or HW @20dB), RFM22B and RFM12B modules from Hoperf (I already experimented with the RFM69 on a mesh network implementation, it worked great).

Best radio chip/s for the job?

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